avalonia: remove workaround for devtools and app lifetime

The issue AvaloniaUI/Avalonia#10296 has been
fixed so we can now remove this workaround.

Author: mjcheetham

src/shared/Core/UI/AvaloniaUi.cs

@@ -53,15 +53,7 @@ public static Task ShowWindowAsync(Func<Window> windowFunc, object dataContext,
 #else
                         .UsePlatformDetect()
 #endif
-                        .LogToTrace()
-                        // Workaround https://github.com/AvaloniaUI/Avalonia/issues/10296
-                        // by always setting a application lifetime.
-                        .SetupWithLifetime(
-                            new ClassicDesktopStyleApplicationLifetime
-                            {
-                                ShutdownMode = ShutdownMode.OnExplicitShutdown
-                            }
-                        );
+                        .LogToTrace();
 
                     appInitialized.Set();