Fix broken ruleutils support for function TRANSFORM clauses.

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

Commit: 4641b2a30f0a2353e875cba48193e33d8ca0b173
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-01-25T18:03:11Z
Releases: 12.6
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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