Fix redirects in Phragment
Summary: This fixes the ZIP controller redirect in Phragment after the external redirect change.
Test Plan: Tested it on my server.
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: epriestley, Korvin, hach-que
Differential Revision: https://secure.phabricator.com/D10350