pgsql: Fix incorrect merge in ECPG code with DECLARE

Fix incorrect merge in ECPG code with DECLARE

The same condition was repeated twice when comparing the connection used
by existing declared statement with the one coming from a fresh DECLARE
statement. This had no consequences, but let's keep the code clean.
Oversight in f576de1.

Author: Shenhao Wang
Discussion: /messages/by-id/OSBPR01MB42149653BC0AB0A49D23C1B8F2C69@OSBPR01MB4214.jpnprd01.prod.outlook.com
Backpatch-through: 14

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/1387925a488eb002b59f3b7f58855a4b711b6415

Modified Files
--------------
src/interfaces/ecpg/preproc/ecpg.header | 1 -
1 file changed, 1 deletion(-)