message: Remove excavated check in TileMap::update
  Presumably there will be no things present if the tile is not excavated,
  so the check is redundant.
diff: @@ -304,8 +304,6 @@ void TileMap::update()
  {
  auto& tile = getTile({mOriginTilePosition + NAS2D::Vector{col, row}, mMouseTilePosition.z});
  - if (tile.excavated())
  - {
  // Tell an occupying thing to update itself.
  if (tile.thing())
  {
  @@ -314,7 +312,6 @@ void TileMap::update()
  }
  }
  }
  - }
  updateTileHighlight();
  }
  