Refactor collision selection logic for histogram updates

Author: dsekihat

EventFiltering/PWGEM/globalDimuonFilter.cxx

@@ -525,11 +525,10 @@ struct globalDimuonFilter {
       if (collision.sel8()) {
         fRegistry.fill(HIST("hCollisionCounter"), 6);
       }
-      if (collision.sel8() && eventCutGroup.minZvtx < collision.posZ() && collision.posZ() < eventCutGroup.maxZvtx) {
-        fRegistry.fill(HIST("hCollisionCounter"), 7);
-      }
 
       if (isSelectedCollision(collision)) {
+        fRegistry.fill(HIST("hCollisionCounter"), 7);
+        
         int nGlobalMuon = 0;
         // LOGF(info, "collision.globalIndex() = %d, fwdtrackIdsThisCollision = %d", collision.globalIndex(), fwdtrackIdsThisCollision.size());
         auto fwdtracks_per_coll = fwdtracks.sliceBy(perCollision, collision.globalIndex());