Bug 23916: (follow-up) Fix column name collision

Bug 23916: (follow-up) Fix column name collision

Seems that joining 'borrowers' into the query run in
C4::Members::GetAllIssues caused a column name collision, which blatted
the retrieval of issues.branchcode. So we now are being a bit more
specific in what is coming from where in the query.

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>