Core/SmartAI: fix warning reported by VS2015

src/server/game/AI/SmartScripts/SmartScript.cpp

@@ -1013,7 +1013,7 @@ void SmartScript::ProcessAction(SmartScriptHolder& e, Unit* unit, uint32 var0, u
 
             for (ObjectList::const_iterator itr = targets->begin(); itr != targets->end(); ++itr)
                 if (IsCreature(*itr))
-                    (*itr)->ToCreature()->UpdateEntry(e.action.updateTemplate.creature, nullptr, e.action.updateTemplate.updateLevel);
+                    (*itr)->ToCreature()->UpdateEntry(e.action.updateTemplate.creature, nullptr, e.action.updateTemplate.updateLevel != 0);
 
             delete targets;
             break;