don't htmlEscape urls in assignment
don't htmlEscape urls in assignment

fixes CNVS-25850

Test plan:
 0. Go to Gradebook in a Course with Assignments.
 1. Click on the name of the assignment.
 2. Verify that the assignment show page loads.

Change-Id: Id876d582b538eea175bb207fbba58a8a4832a699
Reviewed-on: https://gerrit.instructure.com/68825
Reviewed-by: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>
Tested-by: Jenkins
Reviewed-by: Derek Bender <d24d8a7ee520e34b1cec38800225d9f36b552df7@instructure.com>
QA-Review: Pedro Fajardo <121b528f0c2f2e923ce3103793aca31b9a662ac4@instructure.com>
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
Product-Review: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

HotChalk/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,roxolan/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,roxolan/canvas-lms,djbender/canvas-lms,SwinburneOnline/canvas-lms,roxolan/canvas-lms,fronteerio/canvas-lms,redconfetti/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,HotChalk/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms