Don't show Bluetooth and Wi-Fi submenus when plane mode is enabled
Currently (3.34.0) the top-right system popover menu shows Bluetooth and Wi-Fi menus even while plane mode is enabled, taking up space even when they are disabled. This is inconsistent with the choice of keeping the "Plane Mode" menu hidden when airplane mode is disabled: either both (plane AND wifi+bt+modem+...) or neither (plane XOR wifi/bt/modem...) should be shown.