netfilter: nft_ct: fix missing NFT_CT_L3PROTOCOL key in validity checks
netfilter: nft_ct: fix missing NFT_CT_L3PROTOCOL key in validity checks

The key was missing in the list of valid keys, add it.

Signed-off-by: Patrick McHardy <3a4d625ce225e891399f98db96a382ac4a84080b@trash.net>
Signed-off-by: Pablo Neira Ayuso <707d14912bb250caf67dfe0ea4035681fbfc4f56@netfilter.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs