Do not dump all tables twice in pg_backup

postgres/files/pgbackup.sh

@@ -5,5 +5,5 @@ do
 	sudo -u postgres pg_dump -o $DB | gzip -c -- > ${DB}.sql.gz
 done
 
-sudo -u postgres pg_dumpall -U postgres -o | gzip -c -- > pg_dumpall.sql.gz
+sudo -u postgres pg_dumpall -g -U postgres -o | gzip -c -- > pg_dumpall.sql.gz