Avalonia: Another Cleanup (#3494)

* Avalonia: Another Cleanup

This PR is a cleanup to the avalonia code recently added:

- Some XAML file are autoformatted like a previous PR.
- Dlc is renamed to DownloadableContent (Locale exclude).
- DownloadableContentManagerWindow is a bit improved (Fixes #3491).
- Some nits here and there.

* Fix GTK

* Remove AttachDebugDevTools

* Fix last warning

* Fix JSON fields

Ryujinx.Ava/Ui/Models/CheatModel.cs

@@ -11,8 +11,8 @@ namespace Ryujinx.Ava.Ui.Models
 
         public CheatModel(string name, string buildId, bool isEnabled)
         {
-            Name = name;
-            BuildId = buildId;
+            Name      = name;
+            BuildId   = buildId;
             IsEnabled = isEnabled;
         }
 
@@ -22,7 +22,9 @@ namespace Ryujinx.Ava.Ui.Models
             set
             {
                 _isEnabled = value;
+
                 EnableToggled?.Invoke(this, _isEnabled);
+
                 OnPropertyChanged();
             }
         }
@@ -30,6 +32,7 @@ namespace Ryujinx.Ava.Ui.Models
         public string BuildId { get; }
 
         public string BuildIdKey => $"{BuildId}-{Name}";
+
         public string Name { get; }
 
         public string CleanName => Name.Substring(1, Name.Length - 8);