message: examples: fix battery examples
  This is due to the mavlink extension change.
diff: @@ -82,6 +82,8 @@ void send_battery_status(std::shared_ptr<MavlinkPassthrough> mavlink_passthrough
  UINT16_MAX,
  UINT16_MAX}; // mV
  + const uint16_t voltages_ext[4]{0, 0, 0, 0};
  +
  mavlink_message_t message;
  mavlink_msg_battery_status_pack(
  mavlink_passthrough->get_our_sysid(),
  @@ -98,7 +100,9 @@ void send_battery_status(std::shared_ptr<MavlinkPassthrough> mavlink_passthrough
  80, // battery_remaining %
  3600, // time_remaining
  MAV_BATTERY_CHARGE_STATE_OK,
  - 0); // voltages_ext
  + voltages_ext,
  + MAV_BATTERY_MODE_UNKNOWN, // mode
  + 0); // fault_bitmask
  mavlink_passthrough->send_message(message);
  }
  