Delete SSO cookie with Nginx (#1630)

lemonldap-ng-handler/lib/Lemonldap/NG/Handler/Server/Nginx.pm

@@ -71,7 +71,7 @@ sub handler {
     my $cn = $self->Lemonldap::NG::Handler::Main::tsv->{cookieName};
     $cookie =~ s/\b$cn(http)?=[^,;]*[,;\s]*//og;
     my @convertedHdrs =
-      ( 'Content-Length' => 0, Cookie => ( $req->env->{HTTP_COOKIE} // '' ) );
+      ( 'Content-Length' => 0, Cookie => ( $cookie // '' ) );
     my $i = 0;
     while ( my $k = shift @$hdrs ) {
         my $v = shift @$hdrs;