message: Convert use of `getVisibleTile` to `mouseTile` in onMouseUp
diff: @@ -557,10 +557,8 @@ void MapViewState::onMouseUp(NAS2D::EventHandler::MouseButton button, int x, int
  auto& eventHandler = NAS2D::Utility<NAS2D::EventHandler>::get();
  if ((mInsertMode == InsertMode::Tube) && eventHandler.query_shift())
  {
  - Tile* tile = mTileMap->getVisibleTile();
  - if (!tile) { return; }
  -
  - placeTubeEnd(tile);
  + if (!mTileMap->isMouseOverTile()) { return; }
  + placeTubeEnd(&mTileMap->mouseTile());
  }
  }
  }
  