AfterPlatformServicesSetup callbacks are called by AfterApplicationSetupCallback

[gentledepp]

Describe the bug

When registering an AfterPlatformServicesSetup, it is invoked 2 times

1. when the method SetupUnsafe calls the AfterPlatformServicesSetup
2. when the method SetupUnsafe calls AfterApplicationSetupCallback

This is because there is a copy&paste-is issue in AppBuilder: The AfterApplicationSetupCallback is combined with the AfterPlatformServicesSetupCallback

        [PrivateApi]
        public AppBuilder AfterApplicationSetup(Action<AppBuilder> callback)
        {
-            AfterApplicationSetupCallback = (Action<AppBuilder>)Delegate.Combine(AfterPlatformServicesSetupCallback, callback);
+           AfterApplicationSetupCallback = (Action<AppBuilder>)Delegate.Combine(AfterApplicationSetupCallback , callback);
            return Self;
        }

To Reproduce

Register an AfterPlatformSericesSetup callback. On the Platforms Browser and Android, they will get called twice

1. when the method SetupUnsafe calls the AfterPlatformServicesSetup
2. when the method SetupUnsafe calls AfterApplicationSetupCallback

Expected behavior

The callbyck should just be called once - at AfterPlatformServicesSetup

Avalonia version

11.2.1, 11.2.2

OS

WebAssembly, Android

Additional context

I will provide a PR shortly

[gentledepp]

@eszterhorvath @Zeljko-Predjeskovic fyi