[PWGCF] Use correct efficiency for ref flow (#15531)

Co-authored-by: MaximVirta <maxim.m.o.virta@jyu.fi>

Author: MaximVirta

PWGCF/GenericFramework/Tasks/flowGfwV02.cxx

@@ -1007,7 +1007,7 @@ struct FlowGfwV02 {
 
     if (!withinPtPOI && !withinPtRef)
       return;
-    double weff = getJTrackEfficiency(track);
+    double weff = getEfficiency(track, PidCharged);
     if (weff < 0)
       return;