netfilter: nf_tables: fix issue with verdict support

The test on verdict was simply done on the value of the verdict
which is not correct as far as queue is concern. In fact, the test
of verdict test must be done with respect to the verdict mask for
verdicts which are not internal to nftables.

Signed-off-by: Eric Leblond <eric@regit.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>