Normalize spacing a little with Typeahead Browse

Summary: Minor spacing updates. Ref T7841

Test Plan:
Lots of zoooooom.

{F375573}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7841

Differential Revision: https://secure.phabricator.com/D12464