The change in https://github.com/ostreedev/ostree/pull/3413/ was meant
to change when the abootcfg option is set in the BLS file. However,
it also changed the value of this key, using the wrong directory
(bootcsumdir instead of /usr/lib/ostree-boot).
This means that during update, aboot-update gets the wrong path to the
config and cannot correctly write the aboot partition.
Signed-off-by: Alexander Larsson <alexl@redhat.com>