Fix parameter in deprecation message in /misc/cron/archive.php

Parameter passed to console should be --url=... instead of -- url=...
Fix merge conflict for b3ad4d8
Merge branch 'master' of https://github.com/piwik/piwik into fix/archive_message

Conflicts:
	misc/cron/archive.php
Merge pull request #5825 from fhemberger/fix/archive_message

Fix parameter in deprecation message in /misc/cron/archive.php