amadeus: Fix wrong SendCommands logic (#3969)

* amadeus: Fix wrong SendCommands logic

Might help with audio desync, might cause audio stutters, will see!

* Address gdkchan's comment

Ryujinx.Audio/Renderer/Dsp/AudioProcessor.cs

@@ -116,6 +116,11 @@ namespace Ryujinx.Audio.Renderer.Dsp
             };
         }
 
+        public bool HasRemainingCommands(int sessionId)
+        {
+            return _sessionCommandList[sessionId] != null;
+        }
+
         public void Signal()
         {
             _mailbox.SendMessage(MailboxMessage.RenderStart);