security/pwned-check: Remove spaces from sample config file

It contains unnecessary spaces, which results in the following error
messages on command execution.

$ pwned-check
/usr/local/etc/pwned-check.conf: /var/db/pwned-check: Permission denied
/usr/local/etc/pwned-check.conf: https://downloads.pwnedpasswords.com/passwords: not found

PR: 228635
Submitted by: Hiroki Tagato <tagattie@yandex.com>
Approved by: se (maintainer timeout, ~7 months)