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/Weapons/Melee/UI/MeleeSpeechBoundUserInterface.cs

@@ -1,5 +1,6 @@
 using Robust.Client.GameObjects;
 using Content.Shared.Speech.Components;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.Weapons.Melee.UI;
 
@@ -19,17 +20,10 @@ public sealed class MeleeSpeechBoundUserInterface : BoundUserInterface
     {
         base.Open();
 
-        _window = new MeleeSpeechWindow();
-        if (State != null)
-            UpdateState(State);
-
-        _window.OpenCentered();
-
-        _window.OnClose += Close;
+        _window = this.CreateWindow<MeleeSpeechWindow>();
         _window.OnBattlecryEntered += OnBattlecryChanged;
     }
 
-
     private void OnBattlecryChanged(string newBattlecry)
     {
         SendMessage(new MeleeSpeechBattlecryChangedMessage(newBattlecry));