Bug 13572: Add --actives parameter to force_borrower_messaging_defaults script

Bug 13572: Add --actives parameter to force_borrower_messaging_defaults script

1) Apply the patch
2) Create a new patron with random values, except for it expiration date, make it expired (Patrons > New Patron > Student)
3) Enable the system preference called “EnhancedMessagingPreferences”
4) In “Administration" > "Patron categories" > Student, modify the "days in advance", then click "Save"
5) run the script "./misc/maintenance/borrowers-force-messaging-defaults --doit --actives"
6) Validate that the student created in step 2 hasn't changed (Patrons > search)
7) Validate that any other student that isn't expired has changed.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>