Adjust new test case to set wal_keep_segments.

Robert Haas <rhaas@postgresql.org>

Commit: 2208d71a0099bf51c70e1636e10a3e7dffe6581f
Author: Robert Haas <rhaas@postgresql.org>
Date: 2021-06-10T13:34:39Z
Releases: 12.8
Adjust new test case to set wal_keep_segments.

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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