LU-17573 lov: change default object size.

LU-17573 lov: change default object size.

OST don't able to use indirects for long time,
let's switch a object size to extent based.

Test-Parameters: trivial
HPe-bug-id: LUS-11428
Signed-off-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Change-Id: I9759fc7122c41075ebc35d52ade342c37706b041
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54137
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>