Fix #4771: Main Menu music not playing

When audio_init_ride_sounds is called, it calls audio_stop_title_music, but never calls audio_start_title_music. if you do an assert for gTitleMusicChannel it shows it is null. this fixes that. i will say though this is most definitely a band-aid fix, because if run audio_start_title_music in the audio_init_ride_sounds, it still doesn't play out loud. at least on my setup it doesn't.

src/windows/options.c

@@ -1330,6 +1330,7 @@ static void window_options_dropdown(rct_window *w, int widgetIndex, int dropdown
 					gConfigSound.device = strndup(devicename, AUDIO_DEVICE_NAME_SIZE);
 				}
 				config_save_default();
+				audio_start_title_music();
 			}
 			window_invalidate(w);
 			break;