generic/398: update errors to be returned when doing cross renames w/o keys

The bug fix that ultimately landed in the fscrypt tree will return
ENOKEY instead of EPERM when doing a cross rename involving a
directory where the key is not available.  So fix up the golden output
for generic/398 accordingly.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: Eric Biggers <ebiggers3@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>