fix more handlebars ENV regressions, fixes CNVS-10342

test plan:
1. go to the groups UI in a course with no groups
2. the help text should talk about Course level groups, not Account level
3. create a group set
4. edit the group set
5. you should have all the usual fields in the dialog (not just the name)

Change-Id: Id12f7f39247d4ac39b0825bd709416e33c130b33
Reviewed-on: https://gerrit.instructure.com/28614
Reviewed-by: Landon Wilkins <lwilkins@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Marc LeGendre <marc@instructure.com>
QA-Review: Marc LeGendre <marc@instructure.com>