Bug 16276: Make the batch patron deletion tool deal with last_seen

Bug 16276: Make the batch patron deletion tool deal with last_seen

This patch adds the same change as the previous one to the batch patron
deletion tool.

If the pref TrackLastPatronActivity is enabled, the librarians will be
able to delete patrons who do not have been connected since a given
time.

Test plan:
Define a date for the "who have not been connected since" options and
confirm that it works as expected.

Sponsored-by: BULAC - http://www.bulac.fr/
Signed-off-by: Nicolas Legrand <nicolas.legrand@bulac.fr>
https://bugs.koha-community.org/show_bug.cgi?id=12276

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>