Double escape %N (%%N) for pht in Releeph project editor

Summary: Oops, `pht()` interpolates percent escape sequences, but this is a literal "%N".

Test Plan: Edit a Releeph project; notice no errors.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5897

src/applications/releeph/controller/project/ReleephProjectEditController.php

@@ -191,7 +191,7 @@ final class ReleephProjectEditController extends ReleephController {
           ->setValue($release_counter)
           ->setName('releaseCounter')
           ->setCaption(
-            pht("Used by the command line branch cutter's %N field")))
+            pht("Used by the command line branch cutter's %%N field")))
       ->appendChild(
         id(new AphrontFormTextAreaControl())
           ->setLabel(pht('Pick Instructions'))