wifi: add checkbox to disable Management Frame Protection (802.11w) in case of WPA3 encryption

Management Frame Protection is enabled by default for WPA3 on OpenWrt.

But in some cases it causes trouble with certain devices that fails to connect to WiFi Access Point - see https://forum.turris.cz/t/turris-omnia-wifi-health/15704/15

So I propose to add checkbox to WiFi page to optionally disable Management Frame Protection, if it causes trouble. Let it enabled by default, disable it if necessary.

Something along:

[ ] Disable Management Frame Protection
    _In case you have trouble connecting to WiFi Access Point, try disabling Management Frame Protection [...]_

• It should be available only for WPA3 encryption modes - WPA3 & WPA2/3.
• In case of WPA2, keep it hidden.

Depends on: turris/foris-controller/foris-controller#239 (closed)