Fix format truncation issue from ECPG test

Michael Paquier <michael@paquier.xyz>

Commit: a9f301df0e76c38d4544477c1b3e5e29d57904e6
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-08-02T00:51:12Z
Releases: 13.0
Fix format truncation issue from ECPG test

This fixes one warning generated by GCC and present in the test case
array part of ECPG.  This likely got missed in past fixes like 3a4b891
because the compilation of those tests is not done by default.

Reported-by: Sergei Kornilov
Discussion: https://postgr.es/m/14951331562847675@sas2-a1efad875d04.qloud-c.yandex.net

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