Bug 25695: merge of similar code blocks after circulation_rules update

Bug 25695: merge of similar code blocks after circulation_rules update

In onboarding.pl we have second block with adding just one more
rule parameter (maxissueqty) which can be merged to first one
after all parameters now stored in circulation_rules table.

Also this eliminates the need of adding forgotten "warn $@" after
the second eval block.

Mentored-by: Andrew Nugged <nugged@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>