optimize sing-box DNS

v2rayN/v2rayN/Handler/CoreConfigSingbox.cs

@@ -675,8 +675,6 @@ namespace v2rayN.Handler
                     return 0;
                 }
                 //Add the dns of the remote server domain
-                if (Utils.IsDomain(node.address))
-                {
                 if (dns4Sbox.rules is null)
                 {
                     dns4Sbox.rules = new();
@@ -690,9 +688,8 @@ namespace v2rayN.Handler
                 dns4Sbox.rules.Add(new()
                 {
                     server = "local_local",
-                        domain = new List<string>() { node.address }
+                    outbound = "any"
                 });
-                }
 
                 singboxConfig.dns = dns4Sbox;
             }