pgsql: Remove unused assignment in CREATE PUBLICATION grammar.

Remove unused assignment in CREATE PUBLICATION grammar.

Commit 96b3784973 extended the grammar for CREATE PUBLICATION to support
the ALL SEQUENCES variant. However, it unnecessarily prepared publication
objects for this variant, which is not required. This was a copy-paste
oversight in that commit.

Additionally, rename pub_obj_type_list to pub_all_obj_type_list to better
reflect its purpose.

Author: Shlok Kyal <shlok.kyal.oss@gmail.com>
Reviewed-by: Vignesh C <vignesh21@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://postgr.es/m/CANhcyEWbjkFvk3mSy5LFs9+0z4K1gDwQeFj7GUjOe+L4vxs4AA@mail.gmail.com
Discussion: https://postgr.es/m/CAA4eK1LC+KJiAkSrpE_NwvNdidw9F2os7GERUeSxSKv71gXysQ@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/bfb7419b0bbea96d6edde2a6063718a9cc6a1560

Modified Files
--------------
src/backend/parser/gram.y | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)