Prepare audio system and UI for surround

src/dusk/config.cpp

@@ -316,6 +316,7 @@ template class ConfigImpl<BloomMode>;
 template class ConfigImpl<DepthOfFieldMode>;
 template class ConfigImpl<DiscVerificationState>;
 template class ConfigImpl<GameLanguage>;
+template class ConfigImpl<AudioOutputMode>;
 
 template <>
 void ConfigImpl<FrameInterpMode>::loadFromJson(
@@ -639,4 +640,4 @@ void shutdown() {
     s_activeChangeNotifications.clear();
 }
 
-}  // namespace dusk::config
+}  // namespace dusk::config