[PWGDQ] Fixing bug in globalmuon best matches skimming (AliceO2Group#9825)

Author: mcoquet642

PWGDQ/TableProducer/tableMakerMC_withAssoc.cxx

@@ -1076,6 +1076,7 @@ struct TableMakerMC {
     if constexpr (static_cast<bool>(TMuonFillMap)) {
       fFwdTrackIndexMap.clear();
       fFwdTrackFilterMap.clear();
+      fBestMatch.clear();
       muonBasic.reserve(muons.size());
       muonExtra.reserve(muons.size());
       muonCov.reserve(muons.size());