clean up discussions side-comment styling
clean up discussions side-comment styling

Change-Id: I8a035b1c57eca746dfc5ec4bb7d982244379826d
Reviewed-on: https://gerrit.instructure.com/9876
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Ryan Florence <2d8900489f91ac272fd9ce9d5789db6522668ca2@instructure.com>

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