pgsql: Fix psql's --help=commands output line count.

Fix psql's --help=commands output line count.

Evidently somebody neglected to update this sometime in the v10 cycle.

Patching REL_10_STABLE only; this value is about to be obsolete in
HEAD anyway. Noted while examining \gdesc patch.

Branch
------
REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/3fbf09563f839137e5279a390044a18e400fa074

Modified Files
--------------
src/bin/psql/help.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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