Reset fade booleans when silencing music

This fixes a bug where the music would keep playing when a collection
prompt appeared if the music was still fading in at that time.

desktop_version/src/Music.cpp

@@ -310,6 +310,8 @@ void musicclass::haltdasmusik(void)
 void musicclass::silencedasmusik(void)
 {
     musicVolume = 0;
+    m_doFadeInVol = false;
+    m_doFadeOutVol = false;
 }
 
 struct FadeState