Fix outdated code reference

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 8a927e3cfc8f42141072b0a677678d76cec8a1db
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-10-12T07:54:02Z
Releases: 16.0
Fix outdated code reference

ExecCreatePartitionPruneState was renamed by commit 297daa9d4353, but
this test file didn't get the memo.  Repair.

Author: Amit Langote
Discussion: https://postgr.es/m/CA+HiwqFLw=oLX0tP9kcKBmoOExNjDaoAe99dRcxo-GdB9abP9A@mail.gmail.com

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