Realign check icon in aspect dropdown

In the publisher
Before:
![before](https://cloud.githubusercontent.com/assets/930064/3085943/337d12bc-e51f-11e3-84ac-ca9866212e20.png)

After:
![after](https://cloud.githubusercontent.com/assets/930064/3085944/3595f848-e51f-11e3-9776-682b70fff9d3.png)