Added missing generated code from previous commits.

Change-Id: Id7053e4cb5a085a4b047c86ff1f2269329ff7f54

samples/monster_generated.h

@@ -68,7 +68,7 @@ struct EquipmentUnion {
     Reset();
     type = EquipmentTraits<typename T::TableType>::enum_value;
     if (type != Equipment_NONE) {
-      table = new T(std::move(value));
+      table = new T(std::forward<T>(value));
     }
   }
 

tests/monster_test_generated.h

@@ -90,7 +90,7 @@ struct AnyUnion {
     Reset();
     type = AnyTraits<typename T::TableType>::enum_value;
     if (type != Any_NONE) {
-      table = new T(std::move(value));
+      table = new T(std::forward<T>(value));
     }
   }