Bug 28570: Remove log to /tmp file from bor_issues_top.pl

Bug 28570: Remove log to /tmp file from bor_issues_top.pl

This is unusual and must not be done.
Removing it.

Test plan:
Use the "Home > Reports > Patrons with the most checkouts" report and
confirm that it is working correctly after you applied this patch

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>