audio: Cleanup Ryujinx.Audio and fix OpenAL issue (#1746)

* audio: Cleanup SoundIO and fix OpenAL issue

* fix tabs by spaces

* Fix extra spaces

* Fix SoundIO.cs

* Fix ContainsAudioOutBuffer

Ryujinx.Audio/Native/libsoundio/SoundIOBackend.cs

@@ -1,15 +1,13 @@
-using System;
-namespace SoundIOSharp
+namespace SoundIOSharp
 {
-	public enum SoundIOBackend
-	{
-		None = 0,
-		Jack = 1,
-		PulseAudio = 2,
-		Alsa = 3,
-		CoreAudio = 4,
-		Wasapi = 5,
-		Dummy = 6,
-	}
-
-}
+    public enum SoundIOBackend
+    {
+        None,
+        Jack,
+        PulseAudio,
+        Alsa,
+        CoreAudio,
+        Wasapi,
+        Dummy
+    }
+}