Clean up role created in new subscription test.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e9d202a1499d6a70e80d080fcdba07fe6707845d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-03-30T17:07:04Z
Releases: 16.0
Clean up role created in new subscription test.

This oversight broke repeated runs of "make installcheck".

Files