LU-16198 tests: increase margin for sanity/33hh

LU-16198 tests: increase margin for sanity/33hh

The filenames created by sanity test_33hh are randomly generated by
"mktemp" and in some rare cases a larger number of filenames may
fail the CRUSH2 hash detection for 'random' suffixes (all-numeric,
all-uppercase, all-lowercase).  This appears to be failing about
1/200 tests, but since sanity is run frequently (~1400 times/month)
there are still occasional failures reported.

Increase the maximum filename mismatch rate from 20% to 23%, which
would have avoided all of the test failures in the past 3 months.

Test-Parameters: trivial testlist=sanity mdscount=2 mdtcount=4 env=ONLY=33hh,ONLY_REPEAT=400
Fixes: 1ac4b9598a ("LU-15720 dne: add crush2 hash type")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: If63528c4281e543975454d1d84306b0dfcfc0fff
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48713
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>