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/MagicMirror/MagicMirrorBoundUserInterface.cs

@@ -1,6 +1,7 @@
 using Content.Shared.Humanoid.Markings;
 using Content.Shared.MagicMirror;
 using Robust.Client.GameObjects;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.MagicMirror;
 
@@ -17,7 +18,7 @@ public sealed class MagicMirrorBoundUserInterface : BoundUserInterface
     {
         base.Open();
 
-        _window = new();
+        _window = this.CreateWindow<MagicMirrorWindow>();
 
         _window.OnHairSelected += tuple => SelectHair(MagicMirrorCategory.Hair, tuple.id, tuple.slot);
         _window.OnHairColorChanged += args => ChangeColor(MagicMirrorCategory.Hair, args.marking, args.slot);
@@ -29,9 +30,6 @@ public sealed class MagicMirrorBoundUserInterface : BoundUserInterface
             args => ChangeColor(MagicMirrorCategory.FacialHair, args.marking, args.slot);
         _window.OnFacialHairSlotAdded += delegate () { AddSlot(MagicMirrorCategory.FacialHair); };
         _window.OnFacialHairSlotRemoved += args => RemoveSlot(MagicMirrorCategory.FacialHair, args);
-
-        _window.OnClose += Close;
-        _window.OpenCentered();
     }
 
     private void SelectHair(MagicMirrorCategory category, string marking, int slot)
@@ -65,14 +63,5 @@ public sealed class MagicMirrorBoundUserInterface : BoundUserInterface
 
         _window.UpdateState(data);
     }
-
-    protected override void Dispose(bool disposing)
-    {
-        base.Dispose(disposing);
-        if (!disposing)
-            return;
-
-        _window?.Dispose();
-    }
 }