Fix collation dependency in test introduced in 8586bf7ed8.

Andres Freund <andres@anarazel.de>

Commit: 836f634522d2f07efdec2f41d63b582aac95e546
Author: Andres Freund <andres@anarazel.de>
Date: 2019-03-06T19:06:01Z
Releases: 12.0
Fix collation dependency in test introduced in 8586bf7ed8.

Per buildfarm.

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