*Correcting category batch modal radio button

Tracker http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33225&start=0

Before
![catbatch](https://f.cloud.github.com/assets/869724/2074055/016277a6-8d70-11e3-81b5-a93c2ab84b35.png)

After

![catbatchafter](https://f.cloud.github.com/assets/869724/2074062/436e3450-8d70-11e3-8236-4fbe1b7f407c.png)