Tidy up Object Access hooks tests

Andrew Dunstan <andrew@dunslane.net>

Commit: a3b071bbe050252b35c589a7f1a2ee2f7ee3e9d4
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2022-03-22T20:18:06Z
Releases: 15.0
Tidy up Object Access hooks tests

per gripelet from Tom Lane.

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