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/Windows/SettingsWindow.axaml.cs

@@ -1,19 +1,14 @@
 using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Controls.Presenters;
 using Avalonia.Controls.Primitives;
 using Avalonia.Data;
 using Avalonia.Data.Converters;
 using Avalonia.Input;
 using Avalonia.Interactivity;
-using Avalonia.LogicalTree;
-using Avalonia.Markup.Xaml;
-using Avalonia.Threading;
 using FluentAvalonia.Core;
 using FluentAvalonia.UI.Controls;
 using Ryujinx.Ava.Common.Locale;
 using Ryujinx.Ava.Ui.Controls;
-using Ryujinx.Ava.Ui.Models;
 using Ryujinx.Ava.Ui.ViewModels;
 using Ryujinx.HLE.FileSystem;
 using Ryujinx.Input;
@@ -23,8 +18,6 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
 using TimeZone = Ryujinx.Ava.Ui.Models.TimeZone;
 
 namespace Ryujinx.Ava.Ui.Windows
@@ -44,7 +37,6 @@ namespace Ryujinx.Ava.Ui.Windows
 
             InitializeComponent();
             Load();
-            AttachDebugDevTools();
 
             FuncMultiValueConverter<string, string> converter = new(parts => string.Format("{0}  {1}   {2}", parts.ToArray()));
             MultiBinding tzMultiBinding = new() { Converter = converter };
@@ -62,13 +54,6 @@ namespace Ryujinx.Ava.Ui.Windows
 
             InitializeComponent();
             Load();
-            AttachDebugDevTools();
-        }
-
-        [Conditional("DEBUG")]
-        private void AttachDebugDevTools()
-        {
-            this.AttachDevTools();
         }
 
         private void Load()