Bug 29394: (follow-up) Pass correct time format and other corrections

Bug 29394: (follow-up) Pass correct time format and other corrections

This patch makes a few corrections, including adding the
correct Flatpickr date format option when the timepicker is enabled.

Besides past and future date options, I've added a "pastinclusive"
option which allows dates in the past OR today. This option was
previously applied to the checkin page.

The patch also corrects a couple of places where the wrong date field
was modified with the new data attributes.

To test, apply the patch and test the datepickers on the batch checkout
and renew pages. When you select a date and time the "TimeFormat" system
preference should be correctly applied.

The calendar widget on the checkin page should allow you to select
today's date.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>