This patch adds the anonymisation of 'old_issues.issuer' alongside the
existing anonymisation of 'old_issues.borrowernumber'
Signed-off-by: Ben Veasey <B.T.Veasey@lboro.ac.uk> Signed-off-by: Bouzid Fergani <bouzid.fergani@inlibro.com> Signed-off-by: Nick Clemens <nick@bywatersolutions.com> Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>