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/Radio/Ui/IntercomMenu.xaml.cs

@@ -18,15 +18,13 @@ public sealed partial class IntercomMenu : FancyWindow
 
     private readonly List<string> _channels = new();
 
-    public IntercomMenu(Entity<IntercomComponent> entity)
+    public IntercomMenu()
     {
         RobustXamlLoader.Load(this);
         IoCManager.InjectDependencies(this);
 
         MicButton.OnPressed += args => OnMicPressed?.Invoke(args.Button.Pressed);
         SpeakerButton.OnPressed += args => OnSpeakerPressed?.Invoke(args.Button.Pressed);
-
-        Update(entity);
     }
 
     public void Update(Entity<IntercomComponent> entity)