Ryujinx.Ava: Add missing redefinition of app name (#3890)

Before this, Ryujinx would possibly report as "Avalonia Application".

Ryujinx.Ava/App.axaml.cs

@@ -21,6 +21,8 @@ namespace Ryujinx.Ava
     {
         public override void Initialize()
         {
+            Name = $"Ryujinx {Program.Version}";
+
             AvaloniaXamlLoader.Load(this);
         }