Stabilize test introduced in 05c02589, per buildfarm.

Jeff Davis <jdavis@postgresql.org>

Commit: 6669cc769c44b691510c14be12acd9148c74d4d1
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2020-12-27T20:11:57Z
Releases: 13.2
Stabilize test introduced in 05c02589, per buildfarm.

In passing, make the capitalization match the rest of the file.

Reported-by: Tom Lane

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