Network name length is limited to 31 characters instead of 32

[Fingfing]

The network name field only allows for 31 characters (s. error message below). Wifi networks with names which consists of 32 characters (which is the limit in many other systems) can't be used or connected to in Shelly-HomeKit (v. 2.12.2 and earlier).

Tested in: Shelly-HomeKit v.2.12.2 for Shelly Plug S (Build: 20240912-182037/2.12.2-gfff6707).

[markirb]

This is limitation/error in mongoose os

https://github.com/mongoose-os-libs/wifi/blob/master/src/mgos_wifi.c#L132

Not sure if we want to fix that for now