Wifi: bug when several ssid are configured

When you have several wifi networks configured, the wifi2.key remains in clear text in recalbox.conf after reboot. But it seems the encrypted part of this key is append to wifi.key, so:

If wifi 2 is available, you can still connect to wifi 2
But if wifi 2 is unvailable, you can't connect to wifi 1 anymore, because wifi.key is not correct anymore

If you set wifi.key manually in ES, wifi 1 works again until next reboot. If you disable wifi 2, this bug doesn't happen anymore.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information