[SimpleHoster][OneFichierCom] Fix issue #836 ('status': 3)

There were 2 issues:
- the cookie name is "1fichier.com" without leading dot,
- SimpleHoster was ignoring the cookies settings when retrieving html
For the SimpleHoster fix, there may be something simpler ; I copy-pasted a working piece of code (use of plugin.load()) instead of fixing the issue with getURL() not taking into account the cookies.