fix(Scripts/ZulGurub): Mandokir engage combat after Speaker's death (#12771)

init

Co-authored-by: Si1ker <Si1ker@users.noreply.github.com>

src/server/scripts/EasternKingdoms/ZulGurub/boss_mandokir.cpp

@@ -381,6 +381,7 @@ public:
                                 break;
                             case EVENT_STARTED:
                                 me->SetImmuneToAll(false);
+                                me->SetInCombatWithZone();
                                 break;
                             default:
                                 break;