Bug 41104: Remove -sameSite from checkauth() response headers

To test:
1. prove t/db_dependent/Auth.t
2. Observe success

Signed-off-by: David Cook <dcook@prosentient.com.au>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit dbf812869d)
Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>

C4/Auth.pm

@@ -1625,7 +1625,6 @@ sub checkauth {
             charset           => 'utf-8',
             cookie            => $cookie,
             'X-Frame-Options' => 'SAMEORIGIN',
-            -sameSite         => 'Lax'
         }
         ),
         $template->output;