R1:9ea6249a188d

Shrink aphront table headers

Summary: These already have a larger font, the extra height isn't needed. Make them the same size as `td`

Test Plan: Look at a bunch of tables.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14135