[PWGCF] fix initialisation in some process paths in twoParticleCorrelationsMp…

[EmilGorm]

…i.cxx

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 0 warnings, 🔕 1 disabled

[alibuild]

Error while checking build/O2Physics/code-check for daa7d7d at 2026-09-24 19:35:

## sw/BUILD/O2-latest/log
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/TPC/base/src/TPCBaseLinkDef.h:75:56
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/TPC/base/src/TPCBaseLinkDef.h:83:135
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/TPC/base/src/TPCBaseLinkDef.h:84:135
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/Upgrades/ALICE3/ECal/base/src/ECalBaseLinkDef.h:19:48
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/Upgrades/ALICE3/RICH/base/src/RICHBaseLinkDef.h:18:48
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/Upgrades/ALICE3/MID/base/src/MI3BaseLinkDef.h:18:47


## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 1 errors and 1 warnings.'
Found 1 errors and 1 warnings.
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/f1462e5c13ac0f3a38a923a5aa5e1e0db89d9004/O2Physics-code-check/errors.txt
PWGCF/GenericFramework/Tasks/flowGenericFramework.cxx:1205:64: error: no header providing "std::distance" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/f1462e5c13ac0f3a38a923a5aa5e1e0db89d9004/O2Physics-code-check/warnings.txt
PWGCF/GenericFramework/Tasks/flowGenericFramework.cxx:942:11: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
++ [[ 1 -gt 0 ]]
++ exit 1
--

Full log here.