In a surprising move -- the first time we can recall this from SwitchEasy -- the company has actually taken a step back with its new Canvas for iPad Air ($50). The basic folio design is a very familiar one, having been awarded our Case of the Year Award in the past. It combines a hard plastic shell and a canvas cover, which wraps all the way around as a lid and onto the back, forming a folio-style design. We were excited to see button coverage added…