Add 'X' back into databases prefix option...

...(since xSearch is now cataloged as a db).

### Before
![before](https://cloud.githubusercontent.com/assets/96776/4366225/5414f856-42bb-11e4-9f62-3f616e9acd91.png)

### After
![after](https://cloud.githubusercontent.com/assets/96776/4366226/5427206c-42bb-11e4-8f80-f52f12d38369.png)