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/Bed/Cryostorage/CryostorageBoundUserInterface.cs

@@ -1,5 +1,6 @@
 using Content.Shared.Bed.Cryostorage;
 using JetBrains.Annotations;
+using Robust.Client.UserInterface;
 
 namespace Content.Client.Bed.Cryostorage;
 
@@ -17,9 +18,7 @@ public sealed class CryostorageBoundUserInterface : BoundUserInterface
     {
         base.Open();
 
-        _menu = new();
-
-        _menu.OnClose += Close;
+        _menu = this.CreateWindow<CryostorageMenu>();
 
         _menu.SlotRemoveButtonPressed += (ent, slot) =>
         {
@@ -30,8 +29,6 @@ public sealed class CryostorageBoundUserInterface : BoundUserInterface
         {
             SendMessage(new CryostorageRemoveItemBuiMessage(ent, hand, CryostorageRemoveItemBuiMessage.RemovalType.Hand));
         };
-
-        _menu.OpenCentered();
     }
 
     protected override void UpdateState(BoundUserInterfaceState state)
@@ -45,12 +42,4 @@ public sealed class CryostorageBoundUserInterface : BoundUserInterface
                 break;
         }
     }
-
-    protected override void Dispose(bool disposing)
-    {
-        base.Dispose(disposing);
-        if (!disposing)
-            return;
-        _menu?.Dispose();
-    }
 }