option: Fix marshal legacy DNS options

dns/transport/quic/http3.go

@@ -88,7 +88,7 @@ func NewHTTP3(ctx context.Context, logger log.ContextLogger, tag string, options
 	if err != nil {
 		return nil, err
 	}
-	serverAddr := options.ServerOptions.Build()
+	serverAddr := options.DNSServerAddressOptions.Build()
 	if serverAddr.Port == 0 {
 		serverAddr.Port = 443
 	}

dns/transport/quic/quic.go

@@ -54,7 +54,7 @@ func NewQUIC(ctx context.Context, logger log.ContextLogger, tag string, options
 	if len(tlsConfig.NextProtos()) == 0 {
 		tlsConfig.SetNextProtos([]string{"doq"})
 	}
-	serverAddr := options.ServerOptions.Build()
+	serverAddr := options.DNSServerAddressOptions.Build()
 	if serverAddr.Port == 0 {
 		serverAddr.Port = 853
 	}