Kobo driver : support new firmware version 3.0.1

Kobo snuck out new firmware 3.0.1. This has no changes that affect the
driver. As Kobo have done this a few times recently, I am setting the
supported version to 3.0.5. This will allow for a few small bug fix
releases. Fixes #1255363 [Unable to transfer to Kobo Touch](https://bugs.launchpad.net/calibre/+bug/1255363)