Bastion: fixing slight styling issues with delete dialog.

The delete dialog was not absolutely positioned so it was pushing
down the sections below it.  This fixes that issue.

**Before**
![screenshot from 2013-09-04 17 28 49](https://f.cloud.github.com/assets/4116405/1084217/26ca2e6a-15a9-11e3-8574-fd52cdbc3787.png)

**After**
![screenshot from 2013-09-04 17 27 19](https://f.cloud.github.com/assets/4116405/1084208/fb95f0da-15a8-11e3-8458-a6ae53cb0aeb.png)