make mathquill pass jslint
make mathquill pass jslint

Change-Id: I30fc725fcc02d29c1edf05120358edc9eb178e96
Reviewed-on: https://gerrit.instructure.com/10620
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>

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