message: telemetry: actually call RC status subscription
diff: @@ -484,6 +484,10 @@ void TelemetryImpl::process_rc_channels(const mavlink_message_t &message)
  bool rc_ok = (rc_channels.chancount > 0);
  set_rc_status(rc_ok, rc_channels.rssi);
  + if (_rc_status_subscription) {
  + _rc_status_subscription(get_rc_status());
  + }
  +
  _parent->refresh_timeout_handler(_timeout_cookie);
  }
  