Bug 31594: Use count of results for displaying number shown

Bug 31594: Use count of results for displaying number shown

To test:
1 - Create a report with a number of results that is not a multiple of 20
    SELECT barcode FROM items
2 - Run the report
3 - Go to the final page
4 - Note report says 20 shown, but there are less
5 - Apply patch
6 - Reload and confirm correct number of shown is shown :-)

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>