EX-8826 ofd: set compressed file size for fake writes

EX-8826 ofd: set compressed file size for fake writes

When using the fake writes fail_loc, file size setting is
done at the ofd layer, since the osd layer isn't used.  So
we must also handle the compressed file size for this case.

This fixes sanity test 399a with compression.

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: Icda612405908166d043e1e568d0d8bd9cd0c5156
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53483
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Artem Blagodarenko <ablagodarenko@ddn.com>