Bug 20009: use Modern::Perl in Members perl scripts

Bug 20009: use Modern::Perl in Members perl scripts

Test Plan:
Check the following files have been updated from
use strict;
use warnings;
to
use Modern::Perl;

boraccount.pl
default_messageprefs.pl
deletemem.pl
files.pl
mancredit.pl
maninvoice.pl
member-flags.pl
member-password.pl
memberentry.pl
members-home.pl
members-update-do.pl
moremember.pl
notices.pl
pay.pl
paycollect.pl
printfeercpt.pl
printinvoice.pl
printslip.pl
readingrec.pl
routing-lists.pl
setstatus.pl
update-child.pl

Signed-off-by: Jon Knight <J.P.Knight@lboro.ac.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>