Fix theme name typo in noderorder form.

#5928 

This PR addresses https://github.com/openscholar/openscholar/issues/5928#issuecomment-42144504 

Output now seems to be OK:
![selection_134](https://cloud.githubusercontent.com/assets/4497748/2875336/0be22e2c-d417-11e3-92b2-896b7ce2159c.png)