qualcommax: ipq50xx: drop unused factory.ubi for ELECOM WRC-X3000GS2
Drop the firmware image entry "factory.ubi" from IMAGES for ELECOM
WRC-X3000GS2.
`Device/UbiFit` is added in the early stage of working for adding
support of the device, but finally, only `KERNEL_IN_UBI` is neccesary
and factory.ubi is not. So `Device/UbiFit` should have been replaced
to `KERNEL_IN_UBI` but it was forgotten.
Fixes: 3b7d72bc2e ("qualcommax: add support for ELECOM WRC-X3000GS2")
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/18611
Signed-off-by: Robert Marko <robimarko@gmail.com>