Remove some BUI boilerplate (#28399)

* Remove some BUI boilerplate

- The disposals overrides got removed due to the helper method handling it.
- Replace window creation with CreateWindow helper.
- Fixed some stinky code which would cause exceptions.

* More

* moar

* weh

* done

* More BUIs

* More updates

* weh

* moar

* look who it is

* weh

* merge

* weh

* fixes

Content.Client/Arcade/UI/BlockGameBoundUserInterface.cs

@@ -1,5 +1,6 @@
 using Content.Shared.Arcade;
 using Robust.Client.GameObjects;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.Arcade.UI;
 
@@ -15,9 +16,7 @@ public sealed class BlockGameBoundUserInterface : BoundUserInterface
     {
         base.Open();
 
-        _menu = new BlockGameMenu(this);
-        _menu.OnClose += Close;
-        _menu.OpenCentered();
+        _menu = this.CreateWindow<BlockGameMenu>();
     }
 
     protected override void ReceiveMessage(BoundUserInterfaceMessage message)