adds course scope helper to account reports helper
fixes: PFS-563

Change-Id: I4389c04d119f080b9e697bed86364ff73a7f184b
Reviewed-on: https://gerrit.instructure.com/44425
Reviewed-by: Cody Tanner <ctanner@instructure.com>
Tested-by: Rob Orton <rob@instructure.com>
Product-Review: Brandon Broschinsky <brandonbr@instructure.com>
QA-Review: Brandon Broschinsky <brandonbr@instructure.com>