include completed enrollments when loading outcomes
include completed enrollments when loading outcomes

without this change, the student gets a 400 error:
"can only include id's of users in the outcome context" because
they do not have an active enrollment in the course anymore

Change-Id: I4687a55a1bd763b64f3c0bb5d39c015514a26a2b
Reviewed-on: https://gerrit.instructure.com/172980
Reviewed-by: Frank Murphy III <ed7a7068a7b39653c9ca1c429cffcb87c4a069c6@instructure.com>
Tested-by: Jenkins
QA-Review: Neil Gupta <cc4fec8a34766005dd45d48be045c08d736c11ed@instructure.com>
Product-Review: Neil Gupta <cc4fec8a34766005dd45d48be045c08d736c11ed@instructure.com>

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