kallithea: pullrequest overview: fix 'my pullrequests' overview

[Our Own Kallithea]

changeset: 7aef2c2289c8
URL:     https://kallithea-scm.org/repos/kallithea/changeset/7aef2c2289c8
branch:  stable
user:    Thomas De Schampheleire <thomas.de.schampheleire at gmail.com>
date:    Tue Apr 21 09:05:24 2015 +0200

pullrequest overview: fix 'my pullrequests' overview

Commit bd4f453a0055 fixed the pager links on pullrequest overviews, but
broke the 'my pull requests' page due to insufficient testing and
incomplete Python understanding.