lib/config: Add missing quic address in case of non-default port (fixes #6679) (#6703)

* Add quic listener on instance of port blockage

* Update lib/config/config.go

Co-authored-by: Audrius Butkevicius <[email protected]>

lib/config/config.go

@@ -135,8 +135,9 @@ func NewWithFreePorts(myID protocol.DeviceID) (Configuration, error) {
 		cfg.Options.RawListenAddresses = []string{"default"}
 	} else {
 		cfg.Options.RawListenAddresses = []string{
-			fmt.Sprintf("tcp://%s", net.JoinHostPort("0.0.0.0", strconv.Itoa(port))),
+			util.Address("tcp", net.JoinHostPort("0.0.0.0", strconv.Itoa(port))),
 			"dynamic+https://relays.syncthing.net/endpoint",
+			util.Address("quic", net.JoinHostPort("0.0.0.0", strconv.Itoa(port))),
 		}
 	}