Bug 18469: Suspend all holds when specifying a date to resume hold does not keep...

Bug 18469: Suspend all holds when specifying a date to resume hold does not keep date

Name of field had 'datepicker' embedded, this caused variable issue

To test:
 1 - Place several holds for a patron
 2 - Go to holds tab in circulation
 3 - Select a date for suspend all holds until
 4 - Suspend all holds
 5 - Note date is not used, suspended indefinitely
 6 - Apply patch
 7 - Resume all suspended holds
 8 - Select a date for suspend all holds until
 9 - Suspend all holds
10 - Note date is used

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>