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/HealthAnalyzer/UI/HealthAnalyzerBoundUserInterface.cs

@@ -1,6 +1,6 @@
 using Content.Shared.MedicalScanner;
 using JetBrains.Annotations;
-using Robust.Client.GameObjects;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.HealthAnalyzer.UI
 {
@@ -17,12 +17,9 @@ namespace Content.Client.HealthAnalyzer.UI
         protected override void Open()
         {
             base.Open();
-            _window = new HealthAnalyzerWindow
-            {
-                Title = EntMan.GetComponent<MetaDataComponent>(Owner).EntityName,
-            };
-            _window.OnClose += Close;
-            _window.OpenCentered();
+            _window = this.CreateWindow<HealthAnalyzerWindow>();
+
+            _window.Title = EntMan.GetComponent<MetaDataComponent>(Owner).EntityName;
         }
 
         protected override void ReceiveMessage(BoundUserInterfaceMessage message)
@@ -35,17 +32,5 @@ namespace Content.Client.HealthAnalyzer.UI
 
             _window.Populate(cast);
         }
-
-        protected override void Dispose(bool disposing)
-        {
-            base.Dispose(disposing);
-            if (!disposing)
-                return;
-
-            if (_window != null)
-                _window.OnClose -= Close;
-
-            _window?.Dispose();
-        }
     }
 }