Fix broken jsonb_set() logic for replacing array elements.

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

Commit: 9c4cc9e2c75e84a8267396be5cccbfe25b8f63f6
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-10-13T04:25:48Z
Releases: 10.0
Fix broken jsonb_set() logic for replacing array elements.

Commit 0b62fd036 did a fairly sloppy job of refactoring setPath()
to support jsonb_insert() along with jsonb_set().  In its defense,
though, there was no regression test case exercising the case of
replacing an existing element in a jsonb array.

Per bug #14366 from Peng Sun.  Back-patch to 9.6 where bug was introduced.

Report: <20161012065349.1412.47858@wrigleys.postgresql.org>

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