[Kobo] Unbreak the FL ramp-up/down (#5421)
[Kobo] Unbreak the FL ramp-up/down (#5421)

I got my wires crossed.

It's fast on Mk. 5, slow on Mk. 7.
So, slow it down on Mk. 5 so we actually get a ramp and not a jump.

NiLuJe/koreader,pazos/koreader,koreader/koreader,NiLuJe/koreader,Frenzie/koreader,poire-z/koreader,Hzj-jie/koreader,mwoz123/koreader,mihailim/koreader,poire-z/koreader,Frenzie/koreader,Markismus/koreader,koreader/koreader