lime-proto-anygw: hardcode anygw_dev.ifname=br-lan instead of @lan

This is a workaround for a netifd? bug where issuing 'reload_config' after changing network.lan.ipaddr
will hang with 'unregister_netdevice: waiting for anygw to become free' indefinitely.
when anygw_dev.ifname=br-lan, the issue is not present and the new ipaddr is applied

packages/lime-proto-anygw/src/anygw.lua

@@ -18,7 +18,7 @@ function anygw.configure(args)
 	local anygw_ipv4 = ipv4:minhost()
 	anygw_ipv6:prefix(64) -- SLAAC only works with a /64, per RFC
 	anygw_ipv4:prefix(ipv4:prefix())
-	local baseIfname = "@lan"
+	local baseIfname = "br-lan"
 	local argsDev = { macaddr = anygw_mac }
 	local argsIf = { proto = "static" }
 	argsIf.ip6addr = anygw_ipv6:string()