Bug 31276: Report results are limited to 999,999 no matter the actual number of results

Bug 31276: Report results are limited to 999,999 no matter the actual number of results

In Koha, any report that uses C4::Reports::Guided will be limited to 999,999 rows. This is causing problems for larger libraries where some reports may have over a million results.

Test Plan:
1) Create a report "SELECT * FROM borrowers" and run it, note the number
   of results
2) Apply this patch
3) Add the line `<report_results_limit>3</report_results_limit>`
   within the <config> block of your koha-conf.xml
4) Restart all the things!
5) Run the report, download the results as a CSV
6) Note your CSV only has 4 lines, the header and 3 patrons

Signed-off-by: Rachael Laritz <rachael.laritz@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>