Scripts/EoE: Attempt to fix players getting stuck after dying

Attempt to fix players getting stuck after dying caused by a hack that calls SetControlled(true, UNIT_STATE_ROOT) by calling the opposite when a dead player leaves the instance, i.e. on releasing.
Close #24458

(cherry picked from commit dc21ac342ec3293ecf37b6a87244c46a39ff687f)

src/server/scripts/Northrend/Nexus/EyeOfEternity/instance_eye_of_eternity.cpp

@@ -55,6 +55,12 @@ public:
                 player->CastSpell(player, SPELL_SUMMOM_RED_DRAGON_BUDDY, true);
         }
 
+        void OnPlayerLeave(Player* player) override
+        {
+            if (!player->IsAlive())
+                player->SetControlled(false, UNIT_STATE_ROOT);
+        }
+
         bool SetBossState(uint32 type, EncounterState state) override
         {
             if (!InstanceScript::SetBossState(type, state))