Increase width of user list to accomodate for the scroll bar, fixes #675

![new-userlist-with-scrollbar](https://f.cloud.github.com/assets/1035315/110403/e91cdba8-6ac2-11e2-8317-d487ccb737fa.png)

![new-userlist-afk-with-scrollbar](https://f.cloud.github.com/assets/1035315/110408/047b1c8e-6ac3-11e2-9be9-a3cc7f40240d.png)