don't use query cache for course active tab configuration

test plan:
* using rails 3, create a course
* add content through one of the initially inactive
(greyed out) tabs (e.g. Announcements, Files, etc)
* after content is added, confirm that the section is
no longer greyed out and is visible to students

fixes #CNVS-12176

Change-Id: Ideac44872f133e6f18dbf1dd9cbb41de3dfbfd1c
Reviewed-on: https://gerrit.instructure.com/32936
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Nathan Rogowski <nathan@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>