ecpg: Restore detection of unsupported COPY FROM STDIN.

The ecpg command includes code to warn about unsupported COPY FROM STDIN
statements in input files. However, since commit 3d009e45bd,
this functionality has been broken due to a bug introduced in that commit,
causing ecpg to fail to detect the statement.

This commit resolves the issue, restoring ecpg's ability to detect
COPY FROM STDIN and issue a warning as intended.

Back-patch to all supported versions.

Author: Ryo Kanbayashi
Reviewed-by: Hayato Kuroda, Tom Lane
Discussion: 
https://postgr.es/m/canon0ez_t5udcuev8c1yormisjiu5wu681eevzzgkwoeikh...@mail.gmail.com

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/71ef47cf0f20e680319e866220e05c208b3e2bd8

Modified Files
--------------
src/interfaces/ecpg/preproc/ecpg.addons | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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