Remove unreferenced pg_opfamily entry.

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

Commit: 55f3d1029676ad53621716fd15faed5848c9f4cd
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-11-05T17:02:27Z
Releases: 12.0
Remove unreferenced pg_opfamily entry.

The entry with OID 4035, for GIST jsonb_ops, is unused; apparently
it was added in preparation for index support that never materialized.
Remove it, and add a regression test case to detect future mistakes
of the same kind.

Discussion: https://postgr.es/m/17188.1541379745@sss.pgh.pa.us

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