Improve new AND CHAIN tests

Peter Eisentraut <peter@eisentraut.org>

Commit: ef48a0573bf0fc5c7e23f077788a055aad9f5e9e
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-09-09T08:31:35Z
Releases: 12.0
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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