Strictly speaking this isn't a bug, but since all references to catalog
objects are schema-qualified, we might as well be consistent.  The
omission first appeared in commit 1c5d9270, so backpatch to 12.

Author: Justin Pryzby <pryzbyj@telsasoft.com>
Discussion: https://postgr.es/m/20210827193151.GN26465@telsasoft.com