[PWGLF] replaced two TH3D histograms with THnD

[Oussama3030]

I replaced two 3d histograms with a single thnd histogram

[github-actions]

O2 linter results: ❌ 125 errors, ⚠️ 153 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 3a59191 at 2026-08-31 17:56:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 1 errors and 244 warnings.'
Found 1 errors and 244 warnings.
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/a4fde21ab38b7618f62e0cd05097252ffb3de367/O2Physics-code-check/errors.txt
PWGLF/Tasks/Strangeness/sigmaanalysis.cxx:85:8: error: constructor does not initialize these fields: ccdb [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
++ [[ 244 -gt 0 ]]
++ cat /sw/BUILD/a4fde21ab38b7618f62e0cd05097252ffb3de367/O2Physics-code-check/warnings.txt
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:300:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:304:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:308:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:360:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:365:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:370:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:375:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:380:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:385:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:390:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:395:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:400:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:405:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:410:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:415:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:420:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:425:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:430:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:435:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:441:21: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:446:21: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:453:21: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:458:21: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:467:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:477:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:497:101: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:503:70: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:510:85: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:514:108: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:518:124: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:522:124: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:526:154: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:530:81: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:534:122: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:538:98: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:542:63: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:547:376: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:551:56: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Resonances/k892hadronphotonBkg.cxx:555:69: warning: statement should be inside braces [readability-braces-around-statements]
[0 more errors; see full log]

Full log here.