Fix broken ruleutils support for function TRANSFORM clauses.

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

Commit: 41309f716ef5dbe6c3399f448e25f0ec2d23fa3c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-01-25T18:03:12Z
Releases: 9.5.25
Fix broken ruleutils support for function TRANSFORM clauses.

I chanced to notice that this dumped core due to a faulty Assert.
To add insult to injury, the output has been misformatted since v11.
Obviously we need some regression testing here.

Discussion: https://postgr.es/m/d1cc628c-3953-4209-957b-29427acc38c8@www.fastmail.com

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