bootstrap course settings add users checkbox alignment
bootstrap course settings add users checkbox alignment

test plan:
* go to course settings, users tab
* click add users
* select an admin type (teachers, ta's)
* the checkbox that appears should not be misaligned

fixes #CNVS-5538

Change-Id: I1bb4ed1770e21f5dbbf155d4c17474d446b7b679
Reviewed-on: https://gerrit.instructure.com/20101
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>
Product-Review: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Jeremy Putnam <b030d6d6f199f844ec424882be473c2ab9adc93b@instructure.com>

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