rails3 fix for wiki pages spec

Change-Id: Ifcaac6a4d1a5dbfdfdad0798ce0339ce53d3a46d
Reviewed-on: https://gerrit.instructure.com/30147
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>
QA-Review: Derek DeVries <ddevries@instructure.com>