Create wildcard privilege form does not redirect to list view on success

Observed on master (d5e04b386).

1. Log in as admin.
2. Navigate to Security -> Privileges
3. Click Create privilege
4. Pick wildcard.
5. Enter valid name and pattern.
6. Submit ('create privilege').

Expect: to be taken back to the privileges list.
Observe: remain on Create wildcard privilege form. Form submit button still enabled.

There are 2 SecurityIT tests affected by this bug:

• Can add, edit, and delete wildcard privileges
• Can add, edit, and delete content selector privileges