Tails Installer should notify when too small USB drives are not listed on gtk3

Adapt #9130 (closed) to gtk3:

Merge into the feature/gtk3 branch (#8980 (closed)), and adapt.

Feature Branch: kurono:feature/jessie

Original created by @kurono on 9734 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information