chore(DisplayClusterManager): Change IsMaster / IsSlave to IsPrimary / IsSecondary

Source/UniversalLogging/Private/UniversalLogging.cpp

@@ -198,7 +198,7 @@ bool UniversalLoggingImpl::IsClusterMaster()
   {
     return true; // if we are not in cluster mode, we are always the master
   }
-  return Manager->IsMaster() || !Manager->IsSlave();
+  return Manager->IsPrimary() || !Manager->IsSecondary();
 #else
   return true;
 #endif