Access directly via enum constants

Author: JinjooSeo

PWGDQ/Core/DQMlResponse.h

@@ -126,13 +126,13 @@ class DQMlResponse : public MlResponse<TypeOutputScore>
 
       const auto& name = mapIdx->second;
       if (name == "kMass") {
-        dqInputFeatures.push_back(fg[VarManager::fgVarNamesMap["kMass"]]);
+        dqInputFeatures.push_back(fg[kMass]);
       } else if (name == "kPt") {
-        dqInputFeatures.push_back(fg[VarManager::fgVarNamesMap["kPt"]]);
+        dqInputFeatures.push_back(fg[kPt]);
       } else if (name == "kEta") {
-        dqInputFeatures.push_back(fg[VarManager::fgVarNamesMap["kEta"]]);
+        dqInputFeatures.push_back(fg[kEta]);
       } else if (name == "kPhi") {
-        dqInputFeatures.push_back(fg[VarManager::fgVarNamesMap["kPhi"]]);
+        dqInputFeatures.push_back(fg[kPhi]);
       } else if (name == "kPt1") {
         dqInputFeatures.push_back(t1.pt());
       } else if (name == "kITSChi2NCl1") {