Fly Leaf logic not applying to Wacky layouts

[sithel]

see: https://discord.com/channels/726108551428440206/953709370267541634/1166583413566873691

Am unclear where the "add a fly leaf" logic currently resides, but it should totally be moved into the createpages method where we handle PDF source rotation. That way it'd apply everywhere easily without special concerns

(it's an enhancement because I never meant for it to apply to Wackies originally but now it seems like a good idea, once raised)