SAI/GameObject: Despawn the linked trap with the gameobject

Port From (https://github.com/TrinityCore/TrinityCore/commit/8d806f8c6943b54533dbf9a69febee3df1d00430)

Source/Game/Entities/GameObject/GameObject.cs

@@ -919,6 +919,11 @@ namespace Game.Entities
 
         public void Delete()
         {
+            // If nearby linked trap exists, despawn it
+            GameObject linkedTrap = GetLinkedTrap();
+            if (linkedTrap != null)
+                linkedTrap.DespawnOrUnsummon();
+
             SetLootState(LootState.NotReady);
             RemoveFromOwner();