pgsql: Fix pg_dump/pg_restore to restore event trigger comments later.

Fix pg_dump/pg_restore to restore event trigger comments later.

Repair an oversight in commit 8728b2c70: if we're postponing restore
of event triggers to the end, we must also postpone restoring any
comments on them, since of course we cannot create the comments first.
(This opens yet another opportunity for an event trigger to bollix
the restore, but there's no help for that.)

Per bug #16346 from Alexander Lakhin.

Like the previous commit, back-patch to all supported branches.

Hamid Akhtar and Tom Lane

Discussion: https://postgr.es/m/16346-6210ad7a0ea81be1@postgresql.org

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/830471e0dcf67b12f229bfa9489643eb108f580f

Modified Files
--------------
src/bin/pg_dump/pg_backup_archiver.c | 12 ++++++++++++
1 file changed, 12 insertions(+)