Remove PreUpdate, update hash in Save()

osu.Game/Database/ArchiveModelManager.cs

@@ -429,21 +429,10 @@ namespace osu.Game.Database
             using (ContextFactory.GetForWrite())
             {
                 item.Hash = computeHash(item);
-
-                PreUpdate(item);
-
                 ModelStore.Update(item);
             }
         }
 
-        /// <summary>
-        /// Perform any final actions before the update to database executes.
-        /// </summary>
-        /// <param name="item">The <typeparamref name="TModel"/> that is being updated.</param>
-        protected virtual void PreUpdate(TModel item)
-        {
-        }
-
         /// <summary>
         /// Delete an item from the manager.
         /// Is a no-op for already deleted items.