spec: pend fragile quiz spec

Change-Id: I285b9e469a8e4200906802f9d1186e3f45a7637f
Reviewed-on: https://gerrit.instructure.com/41575
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Shawn Meredith <shawn@instructure.com>
Product-Review: Shawn Meredith <shawn@instructure.com>
Tested-by: Bryan Madsen <bryan@instructure.com>
Reviewed-by: Shawn Meredith <shawn@instructure.com>