Apply the wordwrap() hack for "To" to PHPMailerLite

Summary:
Fixes T12372. Long-term fix is T12404, this is a bandaid in the interim.

See T12372 for additional discussion.

Test Plan: Confirmed functional by a user in T12372.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12372

Differential Revision: https://secure.phabricator.com/D17501