Send the correct RequestUpdateAudioRenderer revision in the output header (#587)

* We should be returning our revision instead of what is requested.

Hardware test on a 5.1.0 console

* Added sysversion comment

src/core/hle/service/audio/audren_u.cpp

@@ -150,7 +150,7 @@ private:
         UpdateDataHeader() {}
 
         UpdateDataHeader(const AudioRendererParameter& config) {
-            revision = config.revision;
+            revision = Common::MakeMagic('R', 'E', 'V', '4'); // 5.1.0 Revision
             behavior_size = 0xb0;
             memory_pools_size = (config.effect_count + (config.voice_count * 4)) * 0x10;
             voices_size = config.voice_count * 0x10;