wifi-scripts: fix mcast_rate type (number, not array)
The multicast rate (mcast_rate) is defined as a single numeric value,
not an array. The ucode scripts already expect a single number, and
the OpenWrt documentation specifies this option as an integer [0].
Adjust the wireless schema accordingly. This also fixes the wdev.uc
call path for the iw fallback mesh setup.
[0] - https://openwrt.org/docs/guide-user/network/wifi/basic
Link: https://github.com/openwrt/openwrt/pull/21291
(cherry picked from commit a6eb3d9536b8f0290ab2191780c6d3559843aca9)
Link: https://github.com/openwrt/openwrt/pull/21301
Signed-off-by: Nick Hainke <[email protected]>
Nick Hainke