server+brontide: use ECDH interface for brontide handshake

watchtower/standalone.go

@@ -72,7 +72,7 @@ func New(cfg *Config) (*Standalone, error) {
 	listeners := make([]net.Listener, 0, len(cfg.ListenAddrs))
 	for _, listenAddr := range cfg.ListenAddrs {
 		listener, err := brontide.NewListener(
-			cfg.NodeKeyECDH, listenAddr.String(),
+			nil/*TODO fix in next commit*/, listenAddr.String(),
 		)
 		if err != nil {
 			return nil, err

watchtower/wtclient/interface.go

@@ -109,7 +109,7 @@ type AuthDialer func(localPriv *btcec.PrivateKey, netAddr *lnwire.NetAddress,
 func AuthDial(localPriv *btcec.PrivateKey, netAddr *lnwire.NetAddress,
 	dialer func(string, string) (net.Conn, error)) (wtserver.Peer, error) {
 
-	return brontide.Dial(localPriv, netAddr, dialer)
+	return brontide.Dial(nil/*TODO fix in next commit*/, netAddr, dialer)
 }
 
 // ECDHKeyRing abstracts the ability to derive shared ECDH keys given a