Update Font Awesome .woff path

Summary: We're having trouble with this pointing at the wrong file after D10778; I assume that making it match the others is the proper fix...

Test Plan: Crossed fingers.

Reviewers: epriestley, #blessed_reviewers, chad

Reviewed By: #blessed_reviewers, chad

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10785