Better nightmode handling on the KOA2 & PW4 (#926)
Better nightmode handling on the KOA2 & PW4 (#926)

* Rejig nightmode swaps to take advantage of *both* modes on the KOA2/PW4

Because apparently one is better suited to text content.

i.e., match what the Kindle framework does, now that I've seen some data
of how it behaves ;).
koreader/koreader-base,Frenzie/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,koreader/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base