psql: Fix tab completion for DROP INDEX CONCURRENTLY

psql offered CASCADE after DROP INDEX CONCURRENTLY and an index name,
even though CASCADE is not supported with CONCURRENTLY. Offer only
RESTRICT in this case, while retaining both CASCADE and RESTRICT
for ordinary DROP INDEX.

Backpatch to all supported versions.

Author: Sho Ito <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Reviewed-by: Shihao Zhong <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/cag7l5+7kxgvjugcgxzyqrt7uysc9iytayzx-7yyqtfyxjhv...@mail.gmail.com
Backpatch-through: 14

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/fbb9d76aa0582051af3a87a3b4200365bc409535

Modified Files
--------------
src/bin/psql/tab-complete.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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