Scripts/Auchindoun: Fix a super edge case crash bug with GM far teleports during Blackheart's charm phase. Follow-up to d80d7c6.

(cherry picked from commit 165bc028893a1971d4c75b146e3cd3ce92f13982)

src/server/scripts/Outland/Auchindoun/ShadowLabyrinth/boss_blackheart_the_inciter.cpp

@@ -59,6 +59,8 @@ class BlackheartCharmedPlayerAI : public SimpleCharmedPlayerAI
     void OnCharmed(bool apply) override
     {
         SimpleCharmedPlayerAI::OnCharmed(apply);
+        if (!me->GetMap()->IsDungeon())
+            return;
         if (Creature* blackheart = ObjectAccessor::GetCreature(*me, me->GetInstanceScript()->GetGuidData(DATA_BLACKHEART_THE_INCITER)))
         {
             blackheart->AI()->SetData(0, apply);