fixes CNVS-9363
test plan:
* create a student organized group
* log in as a teacher
* go to the new group management page
* select the "Student Groups" group set
* click on the "+ Group" button
* verify that you can select a join level
** (either "Members are free to join" or
** "Invitation only")
* select "Members are free to join"
* enter a group name
* hit save
* log in as a student
* go to /courses/:course_id/groups
* verify that the group you created appears
** in the "Available Groups" listing
*******************************************
* log in as a teacher
* verify that the "Joining" option only appears
** when adding or editing a group in the
** Student Groups group set
Change-Id: I42c49869d68bebd6deb0ba9beff1fd0e94871911
Reviewed-on: https://gerrit.instructure.com/26304
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Marc LeGendre <marc@instructure.com>
QA-Review: Marc LeGendre <marc@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
bbcc385704