[PWGUD] merge two sides (#15488)

Author: miedema-11

PWGUD/Tasks/flowCorrelationsUpc.cxx

@@ -165,7 +165,7 @@ struct FlowCorrelationsUpc {
 
   // make the filters and cuts.
   Filter trackFilter = (aod::udtrack::isPVContributor == true);
-  Filter collisionFilter = (aod::udcollision::gapSide == (uint8_t)cfgGapSide && (cfgIfVertex == false || aod::collision::posZ < cfgZVtxCut) && (aod::udcollision::occupancyInTime > 0 && aod::udcollision::occupancyInTime < cfgCutOccupancyHigh) && aod::flowcorrupc::truegapside == 1);
+  Filter collisionFilter = ((aod::udcollision::gapSide == (uint8_t)1 || aod::udcollision::gapSide == (uint8_t)0) && (cfgIfVertex == false || aod::collision::posZ < cfgZVtxCut) && (aod::udcollision::occupancyInTime > 0 && aod::udcollision::occupancyInTime < cfgCutOccupancyHigh) && (aod::flowcorrupc::truegapside == 1 || aod::flowcorrupc::truegapside == 0));
 
   using UdTracks = soa::Filtered<soa::Join<aod::UDTracks, aod::UDTracksExtra, aod::UDTracksPID>>;
   using UdTracksFull = soa::Filtered<soa::Join<aod::UDTracks, aod::UDTracksPID, aod::UDTracksExtra, aod::UDTracksFlags, aod::UDTracksDCA>>;