Fix the name used for the transition image from Cudy.
This should make it possible to use the cudy transition image.
Fixes: 9d66b8b312 ("mediatek: filogic: Add support for cudy wr3000h")
Link: https://github.com/openwrt/openwrt/pull/17652
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
0f8a5a5fd6