show colon after hours in countdown face

movement/watch_faces/complication/countdown_face.c

@@ -141,6 +141,7 @@ void countdown_face_activate(movement_settings_t *settings, void *context) {
         watch_date_time now = watch_rtc_get_date_time();
         state->now_ts = watch_utility_date_time_to_unix_time(now, get_tz_offset(settings));
     }
+    watch_set_colon();
 }