cache: Always set NFT_CACHE_TERSE for list cmd with --terse

cache: Always set NFT_CACHE_TERSE for list cmd with --terse

This fixes at least 'nft -t list table ...' and 'nft -t list set ...'.

Note how --terse handling for 'list sets/maps' remains in place since
setting NFT_CACHE_TERSE does not fully undo NFT_CACHE_SETELEM: setting
both enables fetching of anonymous sets which is pointless for that
command.

Reported-by: anton.khazan@gmail.com
Link: https://bugzilla.netfilter.org/show_bug.cgi?id=1735
Suggested-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Phil Sutter <phil@nwl.cc>