psql: Fix incorrect tab completion after CREATE PUBLICATION ... EXCEPT (...)

psql: Fix incorrect tab completion after CREATE PUBLICATION ... EXCEPT (...)

Previously, tab completion after EXCEPT (...) always suggested FROM SERVER.
This was correct for IMPORT FOREIGN SCHEMA ... EXCEPT (...), but became
incorrect once commit fd366065e06 added CREATE PUBLICATION ... EXCEPT (...).

This commit updates tab completion so FROM SERVER is no longer suggested
after CREATE PUBLICATION ... EXCEPT (...), while preserving the existing
behavior for IMPORT FOREIGN SCHEMA ... EXCEPT (...).

Author: Vignesh C <vignesh21@gmail.com>
Reviewed-by: Shveta Malik <shveta.malik@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/CALDaNm1-Fx6Msw6zcRuSjgQdw6asdTyp2DwP-4TCKGYAT+ndsA@mail.gmail.com