koha: make LoginBranchcode available to templates

This fixes adding internal patron messages

koha/Deichman/Auth.pm

@@ -190,16 +190,17 @@ sub templateAndPermissions {
     #    );
     #}
 
-    $self->setTemplatePermissions( $template, $auth, $branch );
+    $self->setTemplatePermissions( $template, $auth, $branch, $auth->{user}->{branchcode} );
     $self->setCustomTemplateParams( $template ); # Various overrides from previous C4::Auth::get_template_and_user
     return $template;
 }
 
 # set template permissions from auth object
 sub setTemplatePermissions {
-    my ($self, $template, $auth, $branch) = @_;
+    my ($self, $template, $auth, $branchname, $branchcode) = @_;
 
-    $template->param( LoginBranchname => $branch );
+    $template->param( LoginBranchname => $branchname );
+    $template->param( LoginBranchcode => $branchcode );
     my $id = $self->{session}->get("id");
     if ($self->{session}->get("admin")) {
         # Admin user login should be removed!