Pull request 1944: 6049-block-ns-root

Updates #6049.

Squashed commit of the following:

commit 288a486b741b4dc57769bd5a0bdd67b4d75cc8c0
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Jul 27 20:59:14 2023 +0300

    dnsforward: fix blocking of ns root

internal/dnsforward/access.go

@@ -90,7 +90,7 @@ func newAccessCtx(allowed, blocked, blockedHosts []string) (a *accessManager, er
 
 	lists := []filterlist.RuleList{
 		&filterlist.StringRuleList{
-			ID:             int(0),
+			ID:             0,
 			RulesText:      b.String(),
 			IgnoreCosmetic: true,
 		},