fix error view specs for rails 3

Change-Id: Ie082aba27ab323134038aac7ec30211caa62d45c
Reviewed-on: https://gerrit.instructure.com/31018
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>