extensions: libipt_REJECT: Avoid to print the default reject with value in the transl...

extensions: libipt_REJECT: Avoid to print the default reject with value in the translation

Avoid to print the reject with value in the translation when the value is the default.

Before this patch:

$ sudo iptables-translate -A FORWARD -p TCP --dport 22 -j REJECT
nft add rule ip filter FORWARD tcp dport 22 counter reject with icmp type port-unreachable

After this patch:

$ sudo iptables-translate -A FORWARD -p TCP --dport 22 -j REJECT
nft add rule ip filter FORWARD tcp dport 22 counter reject

Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>