message: Correct shift for trigger cluster index
  Trigger clusters were shifted by 1 (value vs ID),
  therefore entries were appearing for shifted
  labels. Corrected with this commit.
diff: @@ -177,7 +177,7 @@ Bool_t AliAnalysisTaskEmcalTriggerNormalization::Run(){
  // Fill histogram for the trigger clusters firing the event
  auto triggerclusterhist = static_cast<TH1 *>(fHistos->GetListOfHistograms()->FindObject("hClusterCounterINT7"));
  for(auto triggercluster : triggerclusters) {
  - triggerclusterhist->Fill(triggercluster + 1);
  + triggerclusterhist->Fill(triggercluster);
  }
  if(fCacheTriggerClasses.size()) {
  @@ -251,7 +251,7 @@ Bool_t AliAnalysisTaskEmcalTriggerNormalization::Run(){
  // Fill histogram for the trigger clusters firing the event
  auto triggerclusterhist = static_cast<TH1 *>(fHistos->GetListOfHistograms()->FindObject(Form("hClusterCounter%s", triggerclass.data())));
  for(auto triggercluster : triggerclusters) {
  - triggerclusterhist->Fill(triggercluster + 1);
  + triggerclusterhist->Fill(triggercluster);
  }
  }
  } else {
  @@ -264,7 +264,7 @@ Bool_t AliAnalysisTaskEmcalTriggerNormalization::Run(){
  // Fill histogram for the trigger clusters firing the event
  auto triggerclusterhist = static_cast<TH1 *>(fHistos->GetListOfHistograms()->FindObject(Form("hClusterCounter%s", triggerclass.data())));
  for(auto triggercluster : triggerclusters) {
  - triggerclusterhist->Fill(triggercluster + 1);
  + triggerclusterhist->Fill(triggercluster);
  }
  }
  }
  