[PWGDQ] Fix includes

[vkucera]

No description provided.

[github-actions]

O2 linter results: ❌ 1 errors, ⚠️ 63 warnings, 🔕 20 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 715c3b9 at 2026-09-06 23:24:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 2 errors and 2 warnings.'
Found 2 errors and 2 warnings.
++ [[ 2 -gt 0 ]]
++ cat /sw/BUILD/5fab9e67f9e2e4807af7ae053cc1e879535dcdfe/O2Physics-code-check/errors.txt
PWGDQ/Macros/dqFlowAccWeights.C:49:10: error: variable 'file' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Macros/dqFlowAccWeights.C:56:15: error: variable 'weights' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
++ [[ 2 -gt 0 ]]
++ cat /sw/BUILD/5fab9e67f9e2e4807af7ae053cc1e879535dcdfe/O2Physics-code-check/warnings.txt
PWGDQ/Macros/dqFlowAccWeights.C:69:14: warning: redundant call to 'c_str' [readability-redundant-string-cstr]
PWGDQ/Tasks/mftMchMatcher.cxx:406:14: warning: redundant boolean literal in conditional return statement [readability-simplify-boolean-expr]
++ [[ 2 -gt 0 ]]
++ exit 1
--

Full log here.