Remove skip_value entry in tests
Remove skip_value entry in tests

It became obsolete in 1a02ed28d1eb6a1fe6ed6b12adf454cdf17d0003 but was
accidentally restored when stratisd-predict-usage was revived.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd