amadeus: Add missing compressor effect from REV11 (#4010)

* amadeus: Add missing compressor effect from REV11

This was in my reversing notes but seems I completely forgot to
implement it

Also took the opportunity to simplify the Limiter effect a bit.

* Remove some outdated comment

* Address gdkchan's comments

Ryujinx.Audio/Renderer/Server/CommandProcessingTimeEstimatorVersion2.cs

@@ -543,5 +543,10 @@ namespace Ryujinx.Audio.Renderer.Server
         {
             return 0;
         }
+
+        public uint Estimate(CompressorCommand command)
+        {
+            return 0;
+        }
     }
 }