Fix unintentional behavior change in commit e9931bfb75.

Jeff Davis <jdavis@postgresql.org>

Commit: e3fa2b037c6f0f435838e99200050dc54c306085
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2024-12-03T05:59:02Z
Releases: 18.0
Fix unintentional behavior change in commit e9931bfb75.

Prior to that commit, there was special case to use ASCII case mapping
behavior for the libc provider with a single-byte encoding when that's
the default collation. Commit e9931bfb75 mistakenly eliminated that
special case; this commit restores it.

Discussion: https://postgr.es/m/01a104f0d2179d756261e90d96fd65c36ad6fcf0.camel@j-davis.com

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