Bug 19551: Fix wrong order of operations in cash register report

Bug 19551: Fix wrong order of operations in cash register report

To test:
1 - Find or create a fine for a patron
2 - Write it off
3 - Home -> Reports -> Cash register
4 - Fill in current date and transaction type 'Write off'
5 - Click Submit
-- see your write off
6 - Fill in previous dates and transaction type 'Write off'
7 - Click Submit
-- see your write off (bad)
8 - Apply patch
9 - Rerun steps 3-7
-- write only visible for current date.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>