spec: fix rails3 eql calls in notification_policy_spec

Change-Id: I3bcd56c169ba8ea6e397c57af87da53f3ae31ce0
Reviewed-on: https://gerrit.instructure.com/29588
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Jon Willesen <jonw@instructure.com>
QA-Review: Jon Willesen <jonw@instructure.com>