Fixed: Calling stop on music player should not affect background music.

code/ryzom/client/src/interface_v3/music_player.cpp

@@ -434,7 +434,9 @@ void CMusicPlayer::stop ()
 		return;
 
 	// stop the music only if we are really playing (else risk to stop a background music!)
+	if (_State != Stopped)
 		SoundMngr->stopMusic(0);
+
 	_State = Stopped;
 	_PlayStart = 0;
 	_PauseTime = 0;