LU-9125 test: Correct setstripe -s option

LU-9125 test: Correct setstripe -s option

Some flags for 'lfs setstripe' were deprecated and
tests were not updated. recovery-small test 24b calls
'lfs setstripe' with a '-s' flag which needs to be '-S'.

Test-Parameters: trivial testlist=recovery-small

Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: Iaaaecf0a73a9b659ff44d3c0a50e4386540ba0f3
Reviewed-on: https://review.whamcloud.com/25481
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>