R1:508d86aab6cf

Don't send Phurl mail to the URL object itself

Summary: Fixes T11868. This is silly and does not make sense.

Test Plan: Edited a Phurl URL, verified mail only went to me, not to the object itself.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11868

Differential Revision: https://secure.phabricator.com/D16863