fix url for undeleting quizzes

also fix undeleting practice quizzes

fixes CNVS-11955

test plan:
- in a course, delete a quiz
- go to /courses/:id/undelete
- click the button to undelete the quiz
- it should work

- quick regression on undeleting quizzes/discussion_topics both linked and not
  linked to assignments

Change-Id: I88d30d1baa5685e6c4f16280c9aa34c8965b31fe
Reviewed-on: https://gerrit.instructure.com/32217
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Reviewed-by: Josh Simpson <jsimpson@instructure.com>
Product-Review: Simon Williams <simon@instructure.com>