Correct badge size for dark backgrounded articles

So a more appropriate logo image can be used for the dark bg

### Before

![screen shot 2014-09-02 at 10 37 39](https://cloud.githubusercontent.com/assets/74132/4116432/fabcf0ec-3284-11e4-8140-3355c34c8a49.png)

### After

![screen shot 2014-09-02 at 10 37 48](https://cloud.githubusercontent.com/assets/74132/4116434/fe9aa83a-3284-11e4-9a3e-310c48aace82.png)