Shorten up the prevalue editor fields for smaller screens

Quick fix to make things look a little better in smaller resolutions.

This makes the controls a bit shorter too, not sure how people feel about that.  This is just a quick fix until we can get @DillonMorton to save us :)

![shorten](https://f.cloud.github.com/assets/1396376/2061427/5c6dd0f2-8c51-11e3-8dea-bf6b0f03a89f.png)