pg_resetwal: Fix incorrect error message related to pg_wal/summaries/

pg_resetwal: Fix incorrect error message related to pg_wal/summaries/

A failure while closing pg_wal/summaries/ incorrectly generated a report
about pg_wal/archive_status/.

While at it, this commit adds #undefs for the macros used in
KillExistingWALSummaries() and KillExistingArchiveStatus() to prevent
those values from being misused in an incorrect function context.

Oversight in dc212340058b.

Author: Tianchen Zhang <zhang_tian_chen@163.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/SE2P216MB2390C84C23F428A7864EE07FA19BA@SE2P216MB2390.KORP216.PROD.OUTLOOK.COM
Backpatch-through: 17