FIX - Adding Group to GenericWork

HYDRASIR - 510 #close

I didn't write an automated test for this. But here are the steps that I followed to test:

1. login
2. click on '+' and select 'More Options'
3. click on 'Add New' for Generic Work
4. I entered title with "Title 1"
5. started typing in the Groups field and selected a group ("Group - 1") from the autocomplete
6. check the contributor license agreement
7. click on 'Create Generic work'

This created the GenericWork and navigated to its show view. From there:
8. click on 'Edit this Generic Work'

'Group - 1' link was listed in the Groups field.