Gave the latex glove boxes their own sprite

There was an unused "latex" sprite in storage.dmi but I didn't like it much, so I made a new one and renamed the other "latex_old".

![latex gloves box](https://cloud.githubusercontent.com/assets/7573912/4430226/5aacd622-4624-11e4-8fe4-d507a02d50b8.png)