Remove unnecessary checkpoint from PL regression tests. This was once

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 28c480e9ae64fc239fa1ebe32a981312e65ae1e7
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-01-28T21:17:32Z
Releases: 8.3.0
Remove unnecessary checkpoint from PL regression tests.  This was once
handy to prevent core dump files from disappearing, but it's useless now
because (a) we don't drop core in individual DB subdirectories anymore,
and (b) CREATE DATABASE forces an internal checkpoint anyway.

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