Remove the remaining special handling of procd-ujail in a same way as
the rest of the packages was handled in the commit 4c65359af49b ("build:
fix including busybox, procd and apk/opkg in imagebuilder").
Fixes: 44598c233dd9 ("build: remove broken dependency of metadata on toplevel .config variables")
Signed-off-by: Petr Štetiar <ynezz@true.cz>
Link: https://github.com/openwrt/openwrt/pull/16986
Signed-off-by: Robert Marko <robimarko@gmail.com>