evaluate: flag fwd and queue statements as terminal

evaluate: flag fwd and queue statements as terminal

Both queue and fwd statement end evaluation of a rule:

in
... fwd to "eth0" accept
... queue accept

"accept" is redundant and never evaluated in the kernel.
Add the missing "TERMINAL" flag so the evaluation step will catch
any trailing expressions:

nft add rule filter input queue counter
Error: Statement after terminal statement has no effect

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>