Changed argument $::archivefile to $archivefile on extract_archive

Without this patch I get the following error:
```
Could not retrieve catalog from remote server: Error 400 on SERVER: Invalid parameter archivefile at /etc/puppet/environments/lfernand_ai2325/modules/windows/manifests/freerdp.pp:22 on node l-grizzly-pou.cern.ch
```
I think it's because it's being referenced as a top-scope variable.