zdtm: now tempfs_overmounted will pass so remove crfail

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/zdtm/static/tempfs_overmounted.desc

-{'flavor': 'ns uns', 'flags': 'suid crfail'}
+{'flavor': 'ns uns', 'flags': 'suid'}