Core/SmartAI: Implement SMART_ACTION_SET_ROOT (103)

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

@@ -906,6 +906,7 @@ bool SmartAIMgr::IsEventValid(SmartScriptHolder& e)
         case SMART_ACTION_SEND_TARGET_TO_TARGET:
         case SMART_ACTION_SET_HOME_POS:
         case SMART_ACTION_SET_HEALTH_REGEN:
+        case SMART_ACTION_SET_ROOT:
             break;
         default:
             sLog->outError(LOG_FILTER_SQL, "SmartAIMgr: Not handled action_type(%u), event_type(%u), Entry %d SourceType %u Event %u, skipped.", e.GetActionType(), e.GetEventType(), e.entryOrGuid, e.GetScriptType(), e.event_id);