[GNU/Linux] Drive should not always kill Libreoffice on Ctrl-C exit

How to reproduce:

• Libreoffice is not started
• DirectEdit a document that need Libreoffice
• Let Drive start LibreOffice and open the document
• Create a new document using Libreoffice and write data inside
• Close Drive using Ctrl-C

Constated result:
Libreoffice and all documents opened are closed.

Expected result:
Only the Direct Edited document should be closed or none (same behavior than quit through systray)