Standardize pg_authid oid_symbol values.

Noah Misch <noah@leadboat.com>

Commit: df5efaf4410f94cc1b69e8ade1d64dc92232ec1d
Author: Noah Misch <noah@leadboat.com>
Date: 2021-04-10T19:01:41Z
Releases: 14.0
Standardize pg_authid oid_symbol values.

Commit c9c41c7a337d3e2deb0b2a193e9ecfb865d8f52b used two different
naming patterns.  Standardize on the majority pattern, which was the
only pattern in the last reviewed version of that commit.

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