[PWGHF] Fix filling MC tables for Charm+V0 femto

[fgrosa]

No description provided.

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/code-check for a657c73 at 2026-07-07 12:22:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 4 errors and 0 warnings.'
Found 4 errors and 0 warnings.
++ [[ 4 -gt 0 ]]
++ cat /sw/BUILD/7ce3726bcaae6e2362bf190bfc23dc2dbd12e2ad/O2Physics-code-check/errors.txt
PWGHF/HFC/TableProducer/producerCharmHadronsV0FemtoDream.cxx:215:56: error: do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead [cppcoreguidelines-pro-bounds-array-to-pointer-decay,-warnings-as-errors]
PWGHF/HFC/TableProducer/producerCharmHadronsV0FemtoDream.cxx:279:5: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGHF/HFC/TableProducer/producerCharmHadronsV0FemtoDream.cxx:529:16: error: the variable 'motherparticleMc' is copy-constructed from a const reference but is only used as const reference; consider making it a const reference [performance-unnecessary-copy-initialization,-warnings-as-errors]
PWGHF/HFC/TableProducer/producerCharmHadronsV0FemtoDream.cxx:1181:39: error: the parameter 'particles' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 4 -gt 0 ]]
++ exit 1
--

Full log here.

[alibuild]

Auto-approving on behalf of @fgrosa.