Set default visibility option and remove option from forms

[anusharanganathan]

• [x] Visibility is private for data papers

• [x] Visibility is public for journals

• [x] Remove visibility options from work form

[anusharanganathan]

Data papers - the visibility is private by default, so nothing to do for data papers

Journals - visibility set to open in the controller for new journals.

To hide visibility options, added display:none in css.

Commit 26daf51