wifi profiles: remove bad comment, rename file to wifi.dat

passwd.dat is too unspecific, could be passwords of whatever.

also, we maybe could put more in there, not just ssid and password,
but more data about the known wifi networks.

networkconfig.py

@@ -7,8 +7,7 @@ import time
 ssid_name = "WifiManager"
 ssid_password = "tayfunulu"
 
-# list of WiFi networks (CSV format: ssid,password)
-NETWORK_PROFILES = 'passwd.dat'
+NETWORK_PROFILES = 'wifi.dat'
 
 wlan_ap = network.WLAN(network.AP_IF)
 wlan_sta = network.WLAN(network.STA_IF)