Fix copy-paste mistake in PQcancelCreate
When an OOM occurred, this function was incorrectly setting a status of
CONNECTION_BAD on the passed in PGconn instead of on the newly created
PGcancelConn.
Mistake introduced with
61461a300c1c. Backpatch to 17.
Author: Jelte Fennema-Nio <postgres@jeltef.nl>
Reported-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/
20240630190040.26.nmisch@google.com