i3pystatus: fix wifi device detection

.config/i3pystatus/rfkill-wifi.py

@@ -12,9 +12,18 @@ for line in check_output(['rfkill', '-rn']).decode('UTF-8').splitlines():
         'hard': True if hard == 'blocked' else False,
     }
 
-if devices['phy0']['hard']:
+wifi_dev = None
+for device in devices:
+    if device.startswith('phy'):
+        wifi_dev = device
+        break
+
+if not wifi_dev:
+    print('No WLAN?')
+else:
+    if devices[wifi_dev]['hard']:
         wlan = '#FF0000'
-elif devices['phy0']['soft']:
+    elif devices[wifi_dev]['soft']:
         wlan = '#FF9900'
     else:
         wlan = '#00FF00'