[PWGLF] Update true event and MC filling logic

[hkoley]

No description provided.

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/o2 for 7ae013e at 2026-04-14 10:00:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1542:10: error: 'Inel' conflicts with a previous declaration
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1543:3: error: 'Inel10' conflicts with a previous declaration
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1544:3: error: 'Inelg0' conflicts with a previous declaration
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1545:3: error: 'Inelg010' conflicts with a previous declaration
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1560:6: error: multiple definition of 'enum TrackSelectionType'
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1569:6: error: multiple definition of 'enum PIDCutType'
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1574:8: error: redefinition of 'struct Lambda1520analysisinpp'
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:3012:14: error: redefinition of 'o2::framework::WorkflowSpec defineDataProcessing(const o2::framework::ConfigContext&)'
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for a1e3316 at 2026-04-14 14:13:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Resonances/lambda1520analysisinpp.cxx:1358:52: error: unused parameter 'collisions' [-Werror=unused-parameter]
ninja: build stopped: subcommand failed.

Full log here.