ava: Cleanup AppHost (#4240)

* ava: Cleanup AppHost

This PR cleaned up the AppHost file a bit (adding the infamous extra spaces to improve readability), resorting private vars, remove useless vars, and improve the code here and there, like the AudioBackend check.

Co-Authored-By: gdkchan <5624669+gdkchan@users.noreply.github.com>

* Remove 'renderer"

* Revert currentTime

* revert if condition

Co-authored-by: gdkchan <5624669+gdkchan@users.noreply.github.com>

Ryujinx.Audio/Integration/IHardwareDeviceDriver.cs

@@ -26,6 +26,8 @@ namespace Ryujinx.Audio.Integration
         bool SupportsSampleFormat(SampleFormat sampleFormat);
         bool SupportsChannelCount(uint channelCount);
 
+        static abstract bool IsSupported { get; }
+
         IHardwareDeviceDriver GetRealDeviceDriver()
         {
             return this;