nixos/netbird: Fix configuration of coturn server

        allowedUDPPorts = cfg.openPorts;

        allowedTCPPorts = cfg.openPorts;

        allowedUDPPortRanges = [

        allowedUDPPortRanges = with config.services.coturn; [

          {

            from = cfg.minPort;

            to = cfg.maxPort;

            from = min-port;

            to = max-port;

          }

        ];

      };