Form layout change

Taxon edit form tweak to make it similar to the Product edit form.

**Before**

![screen shot 2013-05-15 at 13 41 20 pm](https://f.cloud.github.com/assets/4784/506750/3b285b42-bd5d-11e2-990f-0fc02f434cfd.png)

**After**

![screen shot 2013-05-15 at 13 42 09 pm](https://f.cloud.github.com/assets/4784/506751/406d3ed8-bd5d-11e2-9491-b960e2a3d465.png)