Bug 18742: Circulation statistics wizard no longer exports the total row

Bug 18742: Circulation statistics wizard no longer exports the total row

To test:
- Run the circulation wizard
- Export to csv
- Note there is no total row
- Apply patch
- Export to csv
- Total row totally there!

Signed-off-by: Christopher Brannon <cbrannon@cdalibrary.org>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit ff22cb46a5f6a1f75422c2a90e1f80ccb05c30b9)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>