Put the clamp on the clamps (bug 1052690)

![clamps](https://cloud.githubusercontent.com/assets/23885/3897154/54837cbc-225f-11e4-88cb-472508902ed2.gif)
Yeah, it was an accidentally-committed artifact from the early days of the clamp script, I think.

Elliflow handles it: https://github.com/mozilla/fireplace/blob/feed/src/media/css/feed.styl#L80-L85