Top align the columns
Top align the columns

Summary:
Noticed there was some funkiness going on in Safari with the columns:

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Test Plan:
Pass show_sat_mvp_private_beta gandalf bridge
Visit an assortment of two column questions in Chrome and Safari:

The 8th question in the first math diagnostic quiz is a good one:
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R&W too
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See that everything looked top aligned after all

Reviewers: johnsullivan

Reviewed By: johnsullivan

Subscribers: aria, #sat

Differential Revision: https://phabricator.khanacademy.org/D18214

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