wifi-scripts: ucode: allow sae_pwe to be modified for AP mode

wifi-scripts: ucode: allow sae_pwe to be modified for AP mode

Some Android devices have issues with H2E causing downgrades to PSK
when using WPA2/3. With WPA3 it doesn't work reliably whatsoever.

My Samsung A55/6 for example has the following behavior:

daemon.info hostapd: lan5g: STA <redacted> IEEE 802.11: authenticated
daemon.notice hostapd: SAE: <redacted> indicates support for SAE H2E, but did not use it
daemon.info hostapd: lan2g: STA <redacted> IEEE 802.11: authenticated
daemon.info hostapd: lan2g: STA <redacted> IEEE 802.11: associated (aid 1)
daemon.notice hostapd: lan5g: Prune association for <redacted>
daemon.notice hostapd: lan2g: AP-STA-CONNECTED <redacted> auth_alg=open
daemon.info hostapd: lan2g: STA <redacted> RADIUS: starting accounting session 8234C696AAC1AE7D
daemon.info hostapd: lan2g: STA <redacted> WPA: pairwise key handshake completed (RSN)
daemon.notice hostapd: lan2g: EAPOL-4WAY-HS-COMPLETED <redacted>

This is also brought up in the issue: https://github.com/openwrt/openwrt/issues/9963

Ultimately this allows users to have the option to at the very least
disable H2E.

Unrelated: a minor cleanup was done so that ieee80211w uses set_default instead.
There is no functional change on that front.

Signed-off-by: Rany Hany <rany_hany@riseup.net>
Link: https://github.com/openwrt/openwrt/pull/22021
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>