message: mission: fix download cancel
diff: @@ -147,7 +147,7 @@ void MissionImpl::download_mission_async(
  return;
  }
  - _parent->mission_transfer().download_items_async(
  + _mission_data.last_download = _parent->mission_transfer().download_items_async(
  MAV_MISSION_TYPE_MISSION,
  [this, callback](
  MAVLinkMissionTransfer::Result result,
  