Groups view is showing both regular and smart groups

On the contacts page: https://go.vumi.org/contacts/people/
* Click on the 'groups' tab in the left hand nav
* Both regular groups and smart groups are displayed
* Only regular groups should be displayed

![screen shot 2013-08-15 at 11 52 41 am](https://f.cloud.github.com/assets/1521387/968044/491f0260-0591-11e3-98d8-d6082be2824f.png)