pgsql: Fix corruption of pg_shdepend when copying deps from template da

Fix corruption of pg_shdepend when copying deps from template database

Using for a new database a template database with shared dependencies
that need to be copied over was causing a corruption of pg_shdepend
because of an off-by-one computation error of the index number used for
the values inserted with a slot.

Issue introduced by e3931d0. Monitoring the rest of the code, there are
no similar mistakes.

Reported-by: Sven Klemm
Author: Aleksander Alekseev
Reviewed-by: Daniel Gustafsson, Michael Paquier
Discussion: https://postgr.es/m/CAJ7c6TP0AowkUgNL6zcAK-s5HYsVHVBRWfu69FRubPpfwZGM9A@mail.gmail.com
Backpatch-through: 14

Branch
------
REL_14_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/5040c96415a062a1016e0a6b9a4dc9f26a7f356e

Modified Files
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src/backend/catalog/pg_shdepend.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)