PreLoggingCrashLog returned its LongPath straight out, so on Windows the crash
dialog named \\?\C:\Users\...\Log202608.log. The prefix is for the Win32 API,
not for a person being asked to find the file and attach it to a bug report.
Return PathWithoutPrefix instead, and use it for the LibationFiles line inside
the record for the same reason. A test now pins that the reported path carries
no prefix and is usable as-is; on Linux the two forms are identical, which is
why local runs could not see this and the Windows CI job could.
While in there: ReplaceInstallFile moved the old file aside and then wrote the
new one, so a copy that failed after the move left nothing at all where a file
used to be. Put the old one back before reporting the failure.
Co-authored-by: rmcrackan <rmcrackan@gmail.com>
