Test plan:
Set pref ReportsExportLimit to some positive integer.
Test if exporting a report respects that limit.
Run t/db_dependent/Koha/Reports.t
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>