fix global account js specs for rails 3

apparently oj is even more conservative than activesupport, and escapes
forward slashes

Change-Id: Ib7c2be9d049034890e3646ed11c8297ae6ea5f6d
Reviewed-on: https://gerrit.instructure.com/31783
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>