Improve new AND CHAIN tests

Peter Eisentraut <peter@eisentraut.org>

Commit: 89b160c32045dd85cc6f9ae6248e34a72931ac67
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-09-09T08:30:22Z
Releases: 13.0
Improve new AND CHAIN tests

Tweak the tests so that we're not just testing the default setting of
transaction_read_only.

Reported-by: fn ln <emuser20140816@gmail.com>

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