Fix collation dependency in test introduced in 8586bf7ed8, take 2.

Andres Freund <andres@anarazel.de>

Commit: 863aa55624d891be57b54f8d12e61cb4fa9b70ef
Author: Andres Freund <andres@anarazel.de>
Date: 2019-03-06T19:27:14Z
Releases: 12.0
Fix collation dependency in test introduced in 8586bf7ed8, take 2.

Per buildfarm.  This time I hopefully actually made sure to get all
the cases...

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