Use auto_uart instead of explicitly listing devices

I wasn't aware of this nifty feature! Since not all Z-Wave sticks show
up with the same device identifier (but hopefully all of them are tty devices),
using `auto_uart` (which automatically makes all tty's accessible to the add-on)
should be more flexible.

ozwcp/config.json

@@ -6,9 +6,7 @@
   "description": "Open ZWave Control Panel",
   "startup": "application",
   "boot": "manual",
-  "devices": [
-    "/dev/ttyACM0:/dev/ttyACM0:rwm"
-  ],
+  "auto_uart": true,
   "map": [
     "config:rw"	
   ],