fix and enable toeplitz hashing of pf_state_keys again.

fix and enable toeplitz hashing of pf_state_keys again.

the hash generated when setting up the pf pdesc struct uses outer
addresses, while the addresses used in the state table goes through
pf_state_key_addr_setup(), which does interesting things with some
ipv6 icmp values. state lookups used pf_state_key_addr_setup(), but
pf_state_key_setup copied the pdesc value, causing an inconsistency.
pf_state_key_setup now calls pf_state_key_addr_setup().

found by anton@
tested by anton@ florian@