gwlb, bug in return_gateway_groups_array() leading in always selecting the...

gwlb, bug in return_gateway_groups_array() leading in always selecting the default gateway. check should have been, this interface is up or none are up.

src/etc/inc/gwlb.inc

@@ -839,7 +839,7 @@ function return_gateway_groups_array()
                 /* process all gateways in this tier */
                 foreach ($tier as $member_item) {
                     $member = $member_item['gwname'];
-                    if (($member_item['up'] || $tiers_online) && isset($gateways_arr[$member])) {
+                    if (($member_item['up'] || $tiers_online == 0) && isset($gateways_arr[$member])) {
                         /* determine interface gateway */
                         $gateway = $gateways_arr[$member];
                         if (is_ipaddr($gateway['gateway'])) {