Fix map whitespace

This just adds a little border to the bottom of the map so that on odd resolution ratios it doesn't look like it didn't load properly (ignore the gray map that did not load properly in the screenshot :P)

![stock_status__map__-_commtrack](https://cloud.githubusercontent.com/assets/152134/5363736/31dbfef0-7fac-11e4-92fc-cd498795ff95.png)