[eslint] turn off no-prototype-builtins
[eslint] turn off no-prototype-builtins

This rule is just there to protect against a pretty esoteric edge
case that we never do. So in effect, in our code, we never will run
into the case where you’ll need it

Read here for why you would need it:
https://eslint.org/docs/rules/no-prototype-builtins

What say ye’all  can we axe this?

Change-Id: I4b9124dd457e843e8429eb701e1ddc77fc86c182
Reviewed-on: https://gerrit.instructure.com/167895
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
QA-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Product-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>

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