the eth1 interface was renamed to wan so also reflect that change in
the leds setup script
Fixes: f26260c7e7 ("mediatek: filogic: Add label wan and cpu for Zyxel EX5601-T0")
Signed-off-by: Andrew Sim <andrewsimz@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/20120
Signed-off-by: Nick Hainke <vincent@systemli.org>