don't set badge counts and crumbs in get_context on api requests

Change-Id: I0ca8a9813ada2d4965577778cff822396764cf5d
Reviewed-on: https://gerrit.instructure.com/40356
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>