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/Pinpointer/UI/NavMapBeaconBoundUserInterface.cs

@@ -1,5 +1,6 @@
 using Content.Shared.Pinpointer;
 using JetBrains.Annotations;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.Pinpointer.UI;
 
@@ -16,19 +17,16 @@ public sealed class NavMapBeaconBoundUserInterface : BoundUserInterface
     protected override void Open()
     {
         base.Open();
-        _window = new NavMapBeaconWindow(Owner);
-        _window.OpenCentered();
-        _window.OnClose += Close;
+        _window = this.CreateWindow<NavMapBeaconWindow>();
+
+        if (EntMan.TryGetComponent(Owner, out NavMapBeaconComponent? beacon))
+        {
+            _window.SetEntity(Owner, beacon);
+        }
 
         _window.OnApplyButtonPressed += (label, enabled, color) =>
         {
             SendMessage(new NavMapBeaconConfigureBuiMessage(label, enabled, color));
         };
     }
-
-    protected override void Dispose(bool disposing)
-    {
-        base.Dispose(disposing);
-        _window?.Dispose();
-    }
 }