[PWGCF] fix call to flow-pt container array before correlations filled, fixed…

[EmilGorm]

… wrong config used in v0

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 1 warnings, 🔕 6 disabled

[alibuild]

Error while checking build/O2Physics/o2 for aa91cc4 at 2026-04-03 22:56:

## sw/BUILD/O2Physics-latest/log
/sw/slc9_x86-64/GCC-Toolchain/v14.2.0-alice2-1/include/c++/14.2.0/bits/stl_algo.h:4219:19: error: assignment of read-only location '__result.__gnu_cxx::__normal_iterator<const float*, std::vector<float> >::operator*()'
/sw/slc9_x86-64/GCC-Toolchain/v14.2.0-alice2-1/include/c++/14.2.0/bits/stl_algo.h:4219:19: error: assignment of read-only location '__result.__gnu_cxx::__normal_iterator<const float*, std::vector<float> >::operator*()'
/sw/slc9_x86-64/GCC-Toolchain/v14.2.0-alice2-1/include/c++/14.2.0/bits/stl_algo.h:4219:19: error: assignment of read-only location '__result.__gnu_cxx::__normal_iterator<const float*, std::vector<float> >::operator*()'
/sw/slc9_x86-64/GCC-Toolchain/v14.2.0-alice2-1/include/c++/14.2.0/bits/stl_algo.h:4219:19: error: assignment of read-only location '__result.__gnu_cxx::__normal_iterator<const float*, std::vector<float> >::operator*()'
ninja: build stopped: subcommand failed.

Full log here.