DerivationFrameworkMCTruth clang llvm9 fix warnings on inconsistent enum

/build/atnight/localbuilds/nightlies/master/athena/PhysicsAnalysis/DerivationFramework/DerivationFrameworkMCTruth/src/GenFilterTool.cxx:60:10: warning: comparison of two values with different enumeration types in switch statement ('MCTruthPartClassifier::ParticleOrigin' and 'MCTruthPartClassifier::ParticleType') [-Wenum-compare-switch]
    case Unknown:
         ^~~~~~~

Mentioning @ssnyder who is looking on some of those

PhysicsAnalysis/DerivationFramework/DerivationFrameworkMCTruth/src/GenFilterTool.cxx

@@ -57,7 +57,7 @@ namespace DerivationFramework {
     ATH_MSG_VERBOSE("Particle has origin " << orig);
 
     switch(orig) {
-    case Unknown:
+    case NonDefined:
     case PhotonConv:
     case DalitzDec:
     case ElMagProc:
@@ -227,4 +227,4 @@ namespace DerivationFramework {
   }
 
 
-} /// namespace
\ No newline at end of file
+} /// namespace