message: Simplify assignment of mTubeStart Point
diff: @@ -772,8 +772,7 @@ void MapViewState::placeTubeStart()
  doAlertMessage(constants::ALERT_INVALID_STRUCTURE_ACTION, constants::ALERT_TUBE_INVALID_LOCATION);
  return;
  }
  - mTubeStart.x(tile->x());
  - mTubeStart.y(tile->y());
  + mTubeStart = tile->position();
  mPlacingTube = true;
  }
  