Adjust new test case to set wal_keep_size.

Robert Haas <rhaas@postgresql.org>

Commit: 3465328aa19e363f3248839bea4521793940ad34
Author: Robert Haas <rhaas@postgresql.org>
Date: 2021-06-10T13:47:25Z
Releases: 13.4
Adjust new test case to set wal_keep_size.

Per buildfarm member conchuela and Kyotaro Horiguchi, it's possible
for the WAL segment that the cascading standby needs to be removed
too quickly. Hopefully this will prevent that.

Kyotaro Horiguchi

Discussion: http://postgr.es/m/20210610.101240.1270925505780628275.horikyota.ntt@gmail.com

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