Remove unnecessary test dependency on the contents of pg_pltemplate.

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

Commit: bbd93667bde56d3900add55479759f33d20ece1e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-08-21T14:43:23Z
Releases: 13.0
Remove unnecessary test dependency on the contents of pg_pltemplate.

Using pg_pltemplate as test data was probably not very forward-looking,
considering we've had many discussions around removing that catalog
altogether.  Use a nearby temp table instead, to make these two test
scripts more self-contained.  This is a better test case anyway, since
it exercises the scenario where the entries in the anyarray column
actually vary in type intra-query.

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