Center the movie list

This centers the movie list. I would have done this for the show list, but I can't open 'TV Shows' because of a bug in the app...

Not centered:
![Not centered](https://cloud.githubusercontent.com/assets/3155049/2811354/70adb11a-ce17-11e3-83e8-f5f7068f4a6f.png)

Centered:
![Centered](https://cloud.githubusercontent.com/assets/3155049/2811355/8983a9b0-ce17-11e3-8c5d-8756e039e8a3.png)