P2P: Fill in default Config Methods in Invitation Request

If the peer is not authorized for GO Negotiation, wps_method is not
actually set. In that case, it is better to fill in our default
config methods rather than end up leaving the field to be zero.

src/p2p/p2p_build.c

@@ -168,7 +168,7 @@ void p2p_buf_add_device_info(struct wpabuf *buf, struct p2p_data *p2p,
 
 	/* Config Methods */
 	methods = 0;
-	if (peer) {
+	if (peer && peer->wps_method != WPS_NOT_READY) {
 		if (peer->wps_method == WPS_PBC)
 			methods |= WPS_CONFIG_PUSHBUTTON;
 		else if (peer->wps_method == WPS_PIN_LABEL)