Fix padding for search bar on non-exhibit page. 

![screen shot 2014-03-04 at 5 04 52 pm](https://f.cloud.github.com/assets/92044/2327569/9024c3e4-a3f1-11e3-917f-be7a21542d80.png)
![screen shot 2014-03-04 at 5 04 59 pm](https://f.cloud.github.com/assets/92044/2327570/90289e92-a3f1-11e3-86c6-496c803e0843.png)