Fix expect file for MinGW32 ECPG regression tests

John Naylor <john.naylor@postgresql.org>

Commit: f3cd6aeb8d8e000414622bf07d26996ee1c5bc44
Author: John Naylor <john.naylor@postgresql.org>
Date: 2021-07-30T22:54:10Z
Releases: 10.18
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