Further stabilize output from rolenames regression test.

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

Commit: 3c8819955023694feeaa456ee60853d0d6d0e60a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-09-26T21:42:20Z
Releases: 14.0
Further stabilize output from rolenames regression test.

Commit e5209bf37 didn't quite get the job done, as I failed to
notice that chksetconfig() also needed to have its ORDER BY
extended.  Per buildfarm member dory.

Report: https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=dory&dt=2020-09-26%2020%3A10%3A13

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