Bug 17299: Display date due correctly on SCO

Bug 17299: Display date due correctly on SCO

Unless it's an hourly loan, date due should not display the time part
(23:59).
Because of bad code in GetPendingIssues, date_due is replaced with a
DateTime object and is copied into date_due_sql.
We need to use this date_due_sql to correctly display the date due in
the sco module.

Test plan:
1/ Enable WebBasedSelfCheck syspref
2/ Check out an item to User A -- Do not use an hourly loan.
3/ Log in to Koha self check ( {OPAC URL}/cgi-bin/koha/sco/sco-main.pl).
4/ Enter User A's cardnumber.
Without this patch, checkouts are
   MM/DD/YYYY 12:00 AM (Timeformat: 12 hour)
or MM/DD/YYYY 00:00    (Timeformat: 24H)
With this patch applied, only the date is displayed

Followed test plan, works as expected.
Signed-off-by: Marc <veron@veron.ch>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>