[FIX] google_drive: use new spreadsheet id

When doing a copy of a google drive spreadsheet (in google_drive.py's
copy_doc method, using the following google API call
https://developers.google.com/drive/v2/reference/files/copy). Google
server return an error if we used the old spreadsheet KeyId.

The new FileId is available in the AlternateLink and this commit updates
it.

similar-to: 00c2a998

opw-647222