Bug 17001: fix due date filter on the overdue report

Bug 17001: fix due date filter on the overdue report

When the TimeFormat system preference is set to "12 hour",
setting a filter on the due date can result in:

- no overdue loans being reported, even if there are some
  that meet the criteria

OR

- overdue loans being omitted from the report if they
  are due on the "until" date in the filter

This patch fixes this by replacing output_pref() with
DateTime::Format::MySQL to format the date filter values
to pass to the SQL query.

To test
-------
[1] Run the overdue report (circ/overdue.pl) and set a filter
    on due date, using values that should bring up one or
    more overdue loans.
[2] Note that zero overdue loans are returned (if using MySQL
    5.5, 5.6, or 5.7 or MariaDB 5) or that loans due on the
    "until" date are omitted (if using MarioDB 10).
[3] Apply the patch and repeat step 1. This time, the correct
    set of overdue loans should be reported.

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>
Signed-off-by: Jason Robb <jrobb@sekls.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>