LU-18580 osc: don't use old mtime from lvb

LU-18580 osc: don't use old mtime from lvb

do not use lvb's mtime if it's older than the current one.

Test-Parameters: env=ONLY=39,ONLY_REPEAT=100 testlist=sanityn
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I1da25d7710313d055985a39989326b9b6a52b68c
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/57521
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>