parser_bison: missing tproxy syntax with port only for inet family

parser_bison: missing tproxy syntax with port only for inet family

 # nft add rule inet filter divert ip daddr 0.0.0.0/0 meta l4proto tcp tproxy ip to :2000
 Error: syntax error, unexpected colon
 add rule inet filter divert ip daddr 0.0.0.0/0 meta l4proto tcp tproxy ip to :2000
                                                                              ^

Syntax with no protocol for tproxy complains with:

 # nft add rule inet filter divert ip daddr 0.0.0.0/0 meta l4proto tcp tproxy to :2000
 Error: Conflicting network layer protocols.
 add rule inet filter divert ip daddr 0.0.0.0/0 meta l4proto tcp tproxy to :2000
                                                                 ^^^^^^^^^^^^^^^

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1310
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>