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* Remove some outdated comment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.Tests/Audio/Renderer/Parameter/Effect/CompressorParameterTests.cs

@@ -0,0 +1,16 @@
+using NUnit.Framework;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Tests.Audio.Renderer.Parameter.Effect
+{
+    class CompressorParameterTests
+    {
+        [Test]
+        public void EnsureTypeSize()
+        {
+            Assert.AreEqual(0x38, Unsafe.SizeOf<CompressorParameter>());
+        }
+    }
+}
+