fix moodle converter spec for rails 3

Change-Id: I5a761e6ce627aa6d12caf6b29daa5d9307445580
Reviewed-on: https://gerrit.instructure.com/30741
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: James Williams  <jamesw@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>