pgsql: Fix DDL deparse of CREATE OPERATOR CLASS

Fix DDL deparse of CREATE OPERATOR CLASS

When an implicit operator family is created, it wasn't getting reported.
Make it do so.

This has always been missing.  Backpatch to 10.

Author: Masahiko Sawada <sawada.mshk@gmail.com>
Reported-by: Leslie LEMAIRE <leslie.lemaire@developpement-durable.gouv.fr>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Michael Paquiër <michael@paquier.xyz>
Discussion: https://postgr.es/m/f74d69e151b22171e8829551b1159e77@developpement-durable.gouv.fr

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/3753a169e110bfedd1c7eef5159d3a5c05cd881e

Modified Files
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src/backend/commands/opclasscmds.c                    | 19 ++++++++++++++-----
src/backend/tcop/utility.c                            |  6 ++++++
.../modules/test_ddl_deparse/expected/opfamily.out    |  1 +
src/test/regress/expected/event_trigger.out           |  5 +++++
src/test/regress/sql/event_trigger.sql                |  4 ++++
5 files changed, 30 insertions(+), 5 deletions(-)