misc: chore: Use UpdateCommand instance for the normal Check for Updates button

src/Ryujinx/UI/ViewModels/MainWindowViewModel.cs

@@ -107,7 +107,7 @@ namespace Ryujinx.Ava.UI.ViewModels
         [ObservableProperty] private ApplicationContextMenu _gridAppContextMenu;
         [ObservableProperty] private bool _updateAvailable;
 
-        public static AsyncRelayCommand UpdateCommand => Commands.Create(async () =>
+        public static AsyncRelayCommand UpdateCommand { get; } = Commands.Create(async () =>
         {
             if (Updater.CanUpdate(true))
                 await Updater.BeginUpdateAsync(true);

src/Ryujinx/UI/Views/Main/MainMenuBarView.axaml.cs

@@ -51,12 +51,8 @@ namespace Ryujinx.Ava.UI.Views.Main
             XciTrimmerMenuItem.Command = Commands.Create(XCITrimmerWindow.Show);
             AboutWindowMenuItem.Command = Commands.Create(AboutWindow.Show);
             CompatibilityListMenuItem.Command = Commands.Create(() => CompatibilityList.Show());
-            
-            UpdateMenuItem.Command = Commands.Create(async () =>
-            {
-                if (Updater.CanUpdate(true))
-                    await Updater.BeginUpdateAsync(true);
-            });
+
+            UpdateMenuItem.Command = MainWindowViewModel.UpdateCommand;
 
             FaqMenuItem.Command = 
                 SetupGuideMenuItem.Command =