fix update/save_without_callbacks for rails 3

replaces update_without_callbacks with
 save_without_callbacks in specs

fixes ArgumentError:
 "tried to create Proc object without a block"

Change-Id: I62275348cd9fff967d21646e7cd963c4b531790e
Reviewed-on: https://gerrit.instructure.com/29255
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>