[FIX] IoT : Waiting for wifi connection

This loop try to get "screen_url" from "URL_SERVER"
So IoT Box need to be connected to the same network as "URL_SERVER". ( Inetrnet or locally )
If can not reach "URL_SERVER" he return a default screen_url
When IoT Box is wired connected there are no problem.
But with Wifi the wireless service take some time to by enabled.
With this fix the loop wait 1 second on every loop.
So if can not reach "URL_SERVER" in 30 seconds he return a default screen_url

addons/point_of_sale/tools/posbox/overwrite_after_init/etc/xdg/openbox/autostart

@@ -15,6 +15,7 @@ if [ -e /home/pi/odoo-remote-server.conf ]
 	var=0
 	while [ ${var} -lt 30 ]; do
 		var=$((var+1))
+		sleep 1
 		status_code=$(wget ${URL_SERVER} --server-response 2>&1|grep 'HTTP/'|awk '{print $2}')
 		if [ ${status_code} -eq 200 ]
 		then