Fix eggregious ghosting on older Kindles (#803)
Fix eggregious ghosting on older Kindles (#803)

* Switch from A2 to DU on older Kindles, too.

A2 is basically terrible on the Touch, for some mysterious reason.
I may have been testing on a K4 or a K3 at the time, because I'd have
noticed otherwise...

(We've always used A2 for "fast" on Kindle, but we used to use "fast"
*very* sparingly before I changed that).

* Re-order that test to abort early on !KINDLE

Frenzie/koreader-base,koreader/koreader-base,houqp/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,houqp/koreader-base,houqp/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,houqp/koreader-base,koreader/koreader-base