fix(Core/Creature): Prevent combat movement disabled creatures from r… (#18428)

* fix(Core/Creature): Prevent combat movement disabled creatures from repositioning if target moves within model boundary

* fixbuild

* Apply suggestions from code review

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

@@ -57,7 +57,7 @@ struct boss_murmur : public BossAI
 {
     boss_murmur(Creature* creature) : BossAI(creature, DATA_MURMUR)
     {
-        SetCombatMovement(false);
+        me->SetCombatMovement(false);
         scheduler.SetValidator([this]
         {
             return !me->HasUnitState(UNIT_STATE_CASTING);