Fix FilterActionWithUrlTest

Summary:
The test got broken by commit 9cb19899 since the action now
takes the value entered literally without transforming it
through QUrl.

Test Plan: Test passes non

Reviewers: mlaurent

Reviewed By: mlaurent

Subscribers: kde-pim

Tags: KDE PIM

Differential Revision: https://phabricator.kde.org/D20290