Skip parts of the edge tutorial that require a touch device (like spread and bottom edge).
For now, we just use "desktop-mode" to imply "no-touch-device". In the future, presumably Design will provide different tutorial layouts for the various device modes we support. For now, they have only blessed a phone version. So I just skip the problematic parts. Fixes: #1434712
Approved by: PS Jenkins bot, Albert Astals Cid