Normalize token line height

Summary: This resolves mysterious extra space below tokens in property list view and timeline view.

Test Plan: Check Property List in Phriction, Timeline examples, Token Application, and giving my fake accounts tokens.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin, chad

Differential Revision: https://secure.phabricator.com/D8651