set cost=14 for unpublished NTCP2 addresses

libi2pd/RouterContext.cpp

@@ -173,6 +173,7 @@ namespace i2p
 			if (address->IsNTCP2 () && (address->port != port || address->ntcp2->isPublished != publish))
 			{
 				address->port = port;
+				address->cost = publish ? 3 : 14;
 				address->ntcp2->isPublished = publish;
 				address->ntcp2->iv = m_NTCP2Keys->iv;
 				updated = true;

libi2pd/RouterInfo.cpp

@@ -700,7 +700,7 @@ namespace data
 		addr->host = host;
 		addr->port = port;
 		addr->transportStyle = eTransportNTCP;
-		addr->cost = 3;
+		addr->cost = port ? 3 : 14; // override from RouterContext::PublishNTCP2Address
 		addr->date = 0;
 		addr->ntcp2.reset (new NTCP2Ext ());
 		addr->ntcp2->isNTCP2Only = true; // NTCP2 only address