Remove selected state styling for left hand navigation item hover background color

Setting a color for:
Left hand navigation item hover background color

Results in the icon having a background color:
![screen shot 2014-01-29 at 12 23 49](https://f.cloud.github.com/assets/1489257/2029270/a9d3da7c-88e0-11e3-9408-224c59b23554.png)

(disregard translation pop-up)

Suggest removing hover bg styling from the selected/active state