John Naylor e29c565343 Remove dead code in formatting.c
Remove some code guarded by IS_MINUS() or IS_PLUS(), where the entire
stanza is inside an else-block where both of these are false. This
should slightly improve test coverage.

While at it, remove coding that apparently assumes that unsetting a
bit is so expensive that we have to first check if it's already set
in the first place.

Per Coverity report from Ranier Vilela
Analysis and review by Justin Pryzby

Discussion: https://www.postgresql.org/message-id/20221223010818.GP1153%40telsasoft.com
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PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.
Description
he World's Most Advanced Open Source Relational Database.
Readme 744 MiB
Languages
C 85.3%
PLpgSQL 6%
Perl 4.4%
Yacc 1.2%
Meson 0.7%
Other 2.2%