Fix 1px button cut off on topic progress up / down buttons. (PR #122)

This fixes an incredibly minor issue with the up / down buttons being cut off by 1px on Chrome & Safari.

Screen Shot 2013-02-11 at 12 02 10

GitHub

Amazed I never noticed this. Could you fill out our CLA? http://www.discourse.org/cla Thanks!

CLA is all signed :slight_smile:

Thanks! Even one pixel makes a difference! :fish: