R1:b36d4025cbf8

Fix a typo in the new "ApplicationEmailHeraldField"

Summary: This rule isn't quite right.

Test Plan: Shipped email in with a rule in effect, saw correct value in transcript.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D13578