[PWGEM/Dilepton] reduce data size of tree ML DDA (AliceO2Group#11798)

Author: dsekihat

PWGEM/Dilepton/DataModel/lmeeMLTables.h

@@ -86,7 +86,7 @@ DECLARE_SOA_DYNAMIC_COLUMN(MeanClusterSizeITSob, meanClusterSizeITSob, [](uint32
 
 // reconstructed track information
 DECLARE_SOA_TABLE(EMPrimaryTracks, "AOD", "EMPTRACK", //!
-                  o2::soa::Index<>, collision::PosZ, collision::NumContrib, evsel::NumTracksInTimeRange, evsel::SumAmpFT0CInTimeRange,
+                  o2::soa::Index<>, collision::NumContrib, evsel::NumTracksInTimeRange, evsel::SumAmpFT0CInTimeRange,
                   track::Pt, track::Eta, track::Phi, track::Tgl, emprimarytrack::Sign,
                   track::DcaXY, track::DcaZ, track::CYY, track::CZZ, track::CZY,
                   track::TPCNClsFindable, emprimarytrack::TPCNClsFound, emprimarytrack::TPCNClsCrossedRows,

PWGEM/Dilepton/TableProducer/treeCreatorElectronMLDDA.cxx

@@ -594,7 +594,7 @@ struct TreeCreatorElectronMLDDA {
       float dcaXY = mDcaInfoCov.getY();
       float dcaZ = mDcaInfoCov.getZ();
 
-      emprimarytracks(collision.posZ(), collision.numContrib(), collision.trackOccupancyInTimeRange(), collision.ft0cOccupancyInTimeRange(),
+      emprimarytracks(collision.numContrib(), collision.trackOccupancyInTimeRange(), collision.ft0cOccupancyInTimeRange(),
                       trackParCov.getPt(), trackParCov.getEta(), trackParCov.getPhi() > 0.f ? trackParCov.getPhi() : trackParCov.getPhi() + 2 * M_PI, trackParCov.getTgl(), track.sign(),
                       dcaXY, dcaZ, trackParCov.getSigmaY2(), trackParCov.getSigmaZ2(), trackParCov.getSigmaZY(),
                       track.tpcNClsFindable(), track.tpcNClsFound(), track.tpcNClsCrossedRows(),