fix sanitization spec failure in ruby 2.1

ruby 2.1 escapes ', 1.9.3 does not. just avoid it in our
spec that isn't even testing sanitization

Change-Id: Ibd050c53ada97f1dce7c5f36cf8b9471811e59ae
Reviewed-on: https://gerrit.instructure.com/36820
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>