Bug 26269: "Date due to" and "Show any items currently checked out" filters doesn...

Bug 26269: "Date due to" and "Show any items currently checked out" filters doesn't work properly in overdues.pl

Filter "Date due to" is now taken into account even when filled with a
future date for the displayed result and downloaded results.
Filter "Show any items currently checked out" is now taken into account
for the downloaded results.

To test:
1- Go to Circulation then to overdues
2a- Add a filter with "Date due To" > today
2b- Check that only the results with "Due date" < today are displayed
(not those with "Due date" between today and the date requested)
2c- Click on "Download file of displayed overdues"
2d- Check that the file contains only the results with "Due date" <
today (not those with "Due date" between today and the date requested)
3a- Reset filter and then add the filter "Show any items currently
checked out"
3b- Check that all the results are displayed (even those with "Due date"
> today)
3c- Click on "Download file of displayed overdues"
3d- Check that the file contains only the results with "Due date" <
today (not those with "Due date" between today and the date requested)
9- Apply the patch
10- Repeat step 1 to 8, checking that all the results corresponding to
the selected filter are now displayed/downloaded

https://bugs.koha-community.org/show_bug.cgi?id=26269

Signed-off-by: Theodoros Theodoropoulos <theod@lib.auth.gr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>