[PWGCF] bitmask fix to fill properly (#15571)

Co-authored-by: MaximVirta <maxim.m.o.virta@jyu.fi>
Co-authored-by: ALICE Action Bot <alibuild@cern.ch>

Author: 3 people

PWGCF/GenericFramework/Tasks/flowGfwV02.cxx

@@ -1016,13 +1016,13 @@ struct FlowGfwV02 {
     // Fill cumulants for different particles
     // ***Need to add proper weights for each particle!***
     if (withinPtRef)
-      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, 0);
+      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, 1);
     if (withinPtPOI && pidInd == PidPions)
-      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, PidPions);
+      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, PidPions + 1);
     if (withinPtPOI && pidInd == PidKaons)
-      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, PidKaons);
+      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, PidKaons + 1);
     if (withinPtPOI && pidInd == PidProtons)
-      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, PidProtons);
+      fGFW->Fill(track.eta(), fSecondAxis->FindBin(track.pt()) - 1, track.phi(), weff * wacc, PidProtons + 1);
     return;
   }