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/Clothing/UI/ChameleonBoundUserInterface.cs

@@ -2,6 +2,7 @@
 using Content.Shared.Clothing.Components;
 using JetBrains.Annotations;
 using Robust.Client.GameObjects;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.Clothing.UI;
 
@@ -22,10 +23,8 @@ public sealed class ChameleonBoundUserInterface : BoundUserInterface
     {
         base.Open();
 
-        _menu = new ChameleonMenu();
-        _menu.OnClose += Close;
+        _menu = this.CreateWindow<ChameleonMenu>();
         _menu.OnIdSelected += OnIdSelected;
-        _menu.OpenCentered();
     }
 
     protected override void UpdateState(BoundUserInterfaceState state)
@@ -42,15 +41,4 @@ public sealed class ChameleonBoundUserInterface : BoundUserInterface
     {
         SendMessage(new ChameleonPrototypeSelectedMessage(selectedId));
     }
-
-    protected override void Dispose(bool disposing)
-    {
-        base.Dispose(disposing);
-
-        if (disposing)
-        {
-            _menu?.Close();
-            _menu = null;
-        }
-    }
 }