Bug 27835: Add a syspref to control fines calculation on closed days

Bug 27835: Add a syspref to control fines calculation on closed days

Bug 27180 added a patch to not update fines on holidays if finesCalendar was set to ignore.
At least it's what it advertised, but not what it did.

It seems that we need to add a new pref to control the calculation of
fines on closed days to answer the different use cases.

Test plan:
With this patch applied you can run the fines.pl cronjob and play with
the new pref ChargeFinesOnCloseDay to generate fines on close days.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>