Scripts/ToC: Fix doors opening/closing during Dreadscale fight

Fix doors opening/closing during Dreadscale fight by sending a CloseDoor command instead of toggling the door state when Dreadscale resets its movement.
Note that bounding the door state to boss movement makes poor sense and should be changed. Other bosses in ToC have this logic and should be updated if they show the same bug.

(cherry picked from commit b5cc8c5b17c96f281728ee08576acfff507d8039)

src/server/game/Instances/InstanceScript.cpp

@@ -426,7 +426,26 @@ void InstanceScript::DoUseDoorOrButton(ObjectGuid guid, uint32 withRestoreTime /
             TC_LOG_ERROR("scripts", "InstanceScript: DoUseDoorOrButton can't use gameobject entry %u, because type is %u.", go->GetEntry(), go->GetGoType());
     }
     else
-        TC_LOG_DEBUG("scripts", "InstanceScript: HandleGameObject failed");
+        TC_LOG_DEBUG("scripts", "InstanceScript: DoUseDoorOrButton failed");
+}
+
+void InstanceScript::DoCloseDoorOrButton(ObjectGuid guid)
+{
+    if (!guid)
+        return;
+
+    if (GameObject* go = instance->GetGameObject(guid))
+    {
+        if (go->GetGoType() == GAMEOBJECT_TYPE_DOOR || go->GetGoType() == GAMEOBJECT_TYPE_BUTTON)
+        {
+            if (go->getLootState() == GO_ACTIVATED)
+                go->ResetDoorOrButton();
+        }
+        else
+            TC_LOG_ERROR("scripts", "InstanceScript: DoCloseDoorOrButton can't use gameobject entry %u, because type is %u.", go->GetEntry(), go->GetGoType());
+    }
+    else
+        TC_LOG_DEBUG("scripts", "InstanceScript: DoCloseDoorOrButton failed");
 }
 
 void InstanceScript::DoRespawnGameObject(ObjectGuid guid, uint32 timeToDespawn /*= MINUTE*/)

src/server/game/Instances/InstanceScript.h

@@ -195,6 +195,7 @@ class InstanceScript : public ZoneScript
 
         // Change active state of doors or buttons
         void DoUseDoorOrButton(ObjectGuid guid, uint32 withRestoreTime = 0, bool useAlternativeState = false);
+        void DoCloseDoorOrButton(ObjectGuid guid);
 
         // Respawns a GO having negative spawntimesecs in gameobject-table
         void DoRespawnGameObject(ObjectGuid guid, uint32 timeToDespawn = MINUTE);

src/server/scripts/Northrend/CrusadersColiseum/TrialOfTheCrusader/boss_northrend_beasts.cpp

@@ -741,7 +741,7 @@ class boss_dreadscale : public CreatureScript
                 switch (pointId)
                 {
                     case 0:
-                        instance->DoUseDoorOrButton(instance->GetGuidData(GO_MAIN_GATE_DOOR));
+                        instance->DoCloseDoorOrButton(instance->GetGuidData(GO_MAIN_GATE_DOOR));
                         me->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE | UNIT_FLAG_NOT_SELECTABLE);
                         me->SetReactState(REACT_AGGRESSIVE);
                         me->SetInCombatWithZone();