Use legacy buzzer functions when playing default tune.

This allows the default tune to be played in LE mode.

Fixes: #275

movement/movement.c

@@ -294,7 +294,14 @@ void movement_request_wake() {
 }
 
 void movement_play_signal(void) {
+#ifdef SIGNAL_TUNE_DEFAULT
+    watch_buzzer_play_note(BUZZER_NOTE_C8, 75);
+    watch_buzzer_play_note(BUZZER_NOTE_REST, 100);
+    watch_buzzer_play_note(BUZZER_NOTE_C8, 100);
+#else
+    // Does not work in LE mode.
     watch_buzzer_play_sequence(signal_tune, NULL);
+#endif // SIGNAL_TUNE_DEFAULT
 }
 
 void movement_play_alarm(void) {