Fix expect file for MinGW32 ECPG regression tests

John Naylor <john.naylor@postgresql.org>

Commit: fa27389c53ca095f52b146d8bdfeb62e8d7f4fb6
Author: John Naylor <john.naylor@postgresql.org>
Date: 2021-07-30T22:52:55Z
Releases: 9.6.23
Fix expect file for MinGW32 ECPG regression tests

On versions 11 and earlier, MinGW32 has a separate expect file for the
regression test changed by master commit 5fcf3945b.

Files