Fix Alternate Rotation issue (only with Folio)

[sithel]

possibly related to #39

as debugged on call! yaaaaaaaay! Thanks @ReachBlueDot & @momijizukamori

My suggestion is hack at calculate_dimensions() -- look around let layout = this.page_layout; and corner case the fuck out of folio duplex to add in page rotations

Maybe then also look at the page ordering over in BOOKLET_LAYOUTS (in constants.js)