fix non qualified table name in Course#update_enrolled_users
fix non qualified table name in Course#update_enrolled_users

refs CNVS-21900

Change-Id: Id01b29e93545f52b50b6ec38a889a3a620b4e68d
Reviewed-on: https://gerrit.instructure.com/65667
Tested-by: Jenkins
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

roxolan/canvas-lms,HotChalk/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,fronteerio/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,snehakachroo1/LSI_replica,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,narigone/canvas,djbender/canvas-lms,redconfetti/canvas-lms,dgynn/canvas-lms,leftplusrightllc/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,roxolan/canvas-lms,SwinburneOnline/canvas-lms,narigone/canvas,venturehive/canvas-lms,dgynn/canvas-lms,SwinburneOnline/canvas-lms,narigone/canvas,matematikk-mooc/canvas-lms,sfu/canvas-lms,narigone/canvas,HotChalk/canvas-lms,SwinburneOnline/canvas-lms,leftplusrightllc/canvas-lms,leftplusrightllc/canvas-lms,instructure/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,grahamb/canvas-lms,roxolan/canvas-lms,redconfetti/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,dgynn/canvas-lms,grahamb/canvas-lms,grahamb/canvas-lms,fronteerio/canvas-lms,dgynn/canvas-lms,matematikk-mooc/canvas-lms,leftplusrightllc/canvas-lms,snehakachroo1/LSI_replica,sfu/canvas-lms,redconfetti/canvas-lms,snehakachroo1/LSI_replica,sfu/canvas-lms,grahamb/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,roxolan/canvas-lms,redconfetti/canvas-lms,matematikk-mooc/canvas-lms,snehakachroo1/LSI_replica,fronteerio/canvas-lms,matematikk-mooc/canvas-lms