rails3: fix failing files integration spec

Change-Id: I464f354a2f5bcc2106c01e1439ed2a2227427031
Reviewed-on: https://gerrit.instructure.com/30649
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cameron Matheson <cameron@instructure.com>
QA-Review: Cameron Matheson <cameron@instructure.com>