message: Fix examples following mavlink update
diff: @@ -96,7 +96,8 @@ void send_battery_status(std::shared_ptr<MavlinkPassthrough> mavlink_passthrough
  -1, // energy consumed hJ
  80, // battery_remaining %
  3600, // time_remaining
  - MAV_BATTERY_CHARGE_STATE_OK);
  + MAV_BATTERY_CHARGE_STATE_OK,
  + 0); // voltages_ext
  mavlink_passthrough->send_message(message);
  }
  