Resolve error closing bluprint full-page modals
Resolve error closing bluprint full-page modals

The Apps tab on the Course settings page uses `page` to manipulate its
contents. Unfortunatly this interferred with operation on the other
tabs.

fixes ADMIN-1000

test plan:
  - follow the steps in the ticket.
  > expect the UI to work as expected
  > expect no js error in the devtools console

Change-Id: Ic046d926c6fa040d081e920efd0b2c0f4c557c9d
Reviewed-on: https://gerrit.instructure.com/151025
Tested-by: Jenkins
Reviewed-by: Carl Kibler <7c2b40129dd885a147d5b2dda56dda016b9a8f57@instructure.com>
Reviewed-by: Dan Minkevitch <2591e5f46f28d303f9dc027d475a5c60d8dea17a@instructure.com>
QA-Review: Deepeeca Soundarrajan <5bcd4b623f00b7fc2942cd1c65c245b30a48a61f@instructure.com>
Product-Review: Ed Schiebel <0ca8a83847a5889cf05cb219c0ab09f6b646243b@instructure.com>

sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms