Stabilize create_table regression test.

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

Commit: 042d8017ec7bca244db4a53bc3d72d218495136d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-09-28T18:48:01Z
Releases: 14.0
Stabilize create_table regression test.

Adding \d+ to the test in commit 2dfa3fea8 was ill-advised,
because the partitions' names are such that their sort order
is locale dependent.  We could rename them to avoid that,
but it doesn't seem worth the trouble; just take \d+ out again.

Per buildfarm.

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