message: mavlink_parameters: fix shadowing bug in param_set
  This meant that params were not actually set because the incorrect
  (empty) message was sent.
diff: @@ -119,7 +119,6 @@ void MavlinkParameters::do_work()
  param_value_buf,
  work.param_value.get_mav_param_type());
  } else {
  - mavlink_message_t message = {};
  mavlink_msg_param_set_pack(_parent->get_own_system_id(),
  _parent->get_own_component_id(),
  &message,
  