Fix typo in drive.html

```
Renamed unarchiveFile into unarchivedFile 
```

Original issue reported on code.google.com by `beaufort.francois` on 22 May 2014 at 7:22

Attachments:
- [drive.html.patch](https://storage.googleapis.com/google-code-attachments/bitjs/issue-2/comment-0/drive.html.patch)
