Bug 11240: ensure that date of restriction is saved when using patron edit screen

Bug 11240: ensure that date of restriction is saved when using patron edit screen

To test:

1/ Edit a patron
2/ Add a restriction with a date (in any format other than iso)
3/ Note the date is not saved
4/ Apply patch
5/ Add restriction again, note it is saved

The problem is output_pref was being called with the wrong parameters

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Note: The issue in on the memberentry form only (not the restriction
form on the check out page).

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>