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/SurveillanceCamera/UI/SurveillanceCameraMonitorBoundUi.cs

@@ -1,6 +1,7 @@
 using Content.Client.Eye;
 using Content.Shared.SurveillanceCamera;
 using Robust.Client.GameObjects;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.SurveillanceCamera.UI;
 
@@ -25,20 +26,12 @@ public sealed class SurveillanceCameraMonitorBoundUserInterface : BoundUserInter
     {
         base.Open();
 
-        _window = new SurveillanceCameraMonitorWindow();
-
-        if (State != null)
-        {
-            UpdateState(State);
-        }
-
-        _window.OpenCentered();
+        _window = this.CreateWindow<SurveillanceCameraMonitorWindow>();
 
         _window.CameraSelected += OnCameraSelected;
         _window.SubnetOpened += OnSubnetRequest;
         _window.CameraRefresh += OnCameraRefresh;
         _window.SubnetRefresh += OnSubnetRefresh;
-        _window.OnClose += Close;
         _window.CameraSwitchTimer += OnCameraSwitchTimer;
         _window.CameraDisconnect += OnCameraDisconnect;
     }