Core/Scripts: prevent Arthas in CoS losing his gossip flag and halting instance progress

src/server/scripts/Kalimdor/CavernsOfTime/CullingOfStratholme/culling_of_stratholme.cpp

@@ -1195,7 +1195,7 @@ public:
                     {
                         QuestStatus status = player->GetQuestStatus(13149);
                         if (status != QUEST_STATUS_COMPLETE && status != QUEST_STATUS_REWARDED)
-                            return false;
+                            return true;
                         AddGossipItemFor(player, GOSSIP_ICON_CHAT, GOSSIP_ITEM_ARTHAS_0, GOSSIP_SENDER_MAIN, GOSSIP_ACTION_INFO_DEF);
                         SendGossipMenuFor(player, 907, me->GetGUID());
                         break;