netfilter: nft_quota: match correctly when the quota just depleted

The xt_quota compares skb length with remaining quota, but the nft_quota
compares it with consumed bytes.

The xt_quota can match consumed bytes up to quota at maximum. But the
nft_quota break match when consumed bytes equal to quota.

i.e., nft_quota match consumed bytes in [0, quota - 1], not [0, quota].

Fixes: 795595f6 ("netfilter: nft_quota: dump consumed quota")
Signed-off-by: Zhongqiu Duan <dzq.aishenghu0@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>