ensure we sanitize submission draft body in a2
ensure we sanitize submission draft body in a2

we need to ensure we are sanitizing the text entry body when we
submit submission drafts in a2

flag=assignments_2_student
fixes WOKE-96

Change-Id: Icc9d141bc91341884badfa67ee34782e43e60a6b
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/216179
Reviewed-by: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>
QA-Review: Steven Burnett <a0b450117c5d20a22d5c4d52bb8ae13adee003d8@instructure.com>
Tested-by: Jenkins
Product-Review: Ryan Norton <65299b45178f94900ff304765e8fbf07bd13b331@instructure.com>

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