Enable Wi-Fi by default

[aiden-leong]

I've a MacBook Pro.

Had to save it via another router's Wi-Fi.

[mikeeq]

Check docs - https://openwrt.org/docs/guide-user/installation/flashing_openwrt_with_wifi_enabled_on_first_boot

There's a way to also do it during sysupgrade. I will try to implement the second option for factory image in my next release.

[MR-Addict]

I was really tricked because of this!