wifi: restart netifd wifi interfaces on the "up" command like the old variant

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38990 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/sbin/wifi

@@ -126,6 +126,7 @@ wifi_updown() {
 	cmd=down
 	[ enable = "$1" ] && {
 		_wifi_updown disable "$2"
+		ubus_wifi_cmd "$cmd" "$2"
 		scan_wifi
 		cmd=up
 	}