fix: get track from step from handler in SD action

src/detectors/pid/sdet/src/PhotoMultiplierSDAction.cpp

@@ -95,7 +95,7 @@ namespace dd4hep {
       ++m_userData.nPhotons;
 
       if ((h.trkPdgID() == -22) || (h.trkPdgID() == 22)) {
-        h.track->SetTrackStatus(fStopAndKill);
+        h.step->GetTrack()->SetTrackStatus(fStopAndKill);
       }
 
       return true;