Unbeta Legalpad

Summary: Fixes T3116. This app is still pretty basic, but solves a real problem and doesn't have any major missing features.

Test Plan: Observed no "Beta" on launcher.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T3116

Differential Revision: https://secure.phabricator.com/D9774