Changed the upstart file to work when unprovisioned (AP mode)

This change made my vacuum bring up Valetudo when unprovisioned
(i.e. when it had not joined a host network and was running the AP
roborock-vacuum-s5_... one itself).

deployment/valetudo.conf

@@ -1,7 +1,7 @@
 #!upstart
 description "Valetudo"
 
-start on net-device-up IFACE=wlan0
+start on started network-interface INTERFACE=wlan0
 stop on runlevel [06]
 
 oom score 1000