Correctly copy the target host identification in PQcancelCreate.

Correctly copy the target host identification in PQcancelCreate.

PQcancelCreate failed to copy struct pg_conn_host's "type" field,
instead leaving it zero (a/k/a CHT_HOST_NAME).  This seemingly
has no great ill effects if it should have been CHT_UNIX_SOCKET
instead, but if it should have been CHT_HOST_ADDRESS then a
null-pointer dereference will occur when the cancelConn is used.

Bug: #18974
Reported-by: Maxim Boguk <[email protected]>
Author: Sergei Kornilov <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: https://postgr.es/m/18974-575f02b2168b36b3@postgresql.org
Backpatch-through: 17