evaluate: missing datatype definition in implicit_set_declaration()

evaluate: missing datatype definition in implicit_set_declaration()

set->data from implicit_set_declaration(), otherwise, set_evaluation()
bails out with:

 # nft -f /etc/nftables/inet-filter.nft
 /etc/nftables/inet-filter.nft:8:32-54: Error: map definition does not specify
 mapping data type
                tcp dport vmap { 22 : jump ssh_input }
                               ^^^^^^^^^^^^^^^^^^^^^^^
 /etc/nftables/inet-filter.nft:13:26-52: Error: map definition does not specify
 mapping data type
                 iif vmap { "eth0" : jump wan_input }
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^

Add a test to cover this case.

Fixes: 7aa08d45031e ("evaluate: Perform set evaluation on implicitly declared (anonymous) sets")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=208093
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>