pki: T9135: restore an ACME certificate backup on any request failure

certbot_request() ultimately shells out via cmdl(), which can fail with
something other than ConfigError - e.g. FileNotFoundError if the certbot
binary itself is missing, or another OSError from the underlying process
call. The backup/restore wrapper around a certificate replacement only
caught ConfigError, so any other failure skipped restoration entirely and
left the certificate deleted with no way back, defeating the point of taking
a backup before requesting a replacement in the first place.

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