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: <>



Modified Files
src/backend/utils/adt/jsonfuncs.c   | 12 ++++++------
src/test/regress/expected/jsonb.out |  6 ++++++
src/test/regress/sql/jsonb.sql      |  1 +
3 files changed, 13 insertions(+), 6 deletions(-)

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