[PWGLF] One more minor optimization change to str builder module (#12412)

Author: ddobrigk

PWGLF/Utils/strangenessBuilderModule.h

@@ -1338,6 +1338,12 @@ class BuilderModule
     for (size_t iv0 = 0; iv0 < v0List.size(); iv0++) {
       const auto& v0 = v0List[sorted_v0[iv0]];
 
+      if (!v0BuilderOpts.generatePhotonCandidates.value && v0.v0Type > 1) {
+        // skip photons if not requested
+        products.v0dataLink(-1, -1);
+        continue;
+      }
+
       if (!baseOpts.mEnabledTables[kV0CoresBase] && v0Map[iv0] == -2) {
         // this v0 hasn't been used by cascades and we're not generating V0s, so skip it
         products.v0dataLink(-1, -1);
@@ -1389,7 +1395,7 @@ class BuilderModule
         }
       }
 
-      if (!straHelper.buildV0Candidate(v0.collisionId, pvX, pvY, pvZ, posTrack, negTrack, posTrackPar, negTrackPar, v0.isCollinearV0, baseOpts.mEnabledTables[kV0Covs], true)) {
+      if (!straHelper.buildV0Candidate(v0.collisionId, pvX, pvY, pvZ, posTrack, negTrack, posTrackPar, negTrackPar, v0.isCollinearV0, baseOpts.mEnabledTables[kV0Covs], v0BuilderOpts.generatePhotonCandidates)) {
         products.v0dataLink(-1, -1);
         continue;
       }