Bug 29478: Today should select now for pastinclusive

Bug 29478: Today should select now for pastinclusive

If Today is clicked when we only allow dates in the past and today/now,
we should select the current date/time
We need to update the maxDate to make it up-to-date, or the maxDate may
be set to the minute before and clicking Today will blank the input.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>