Fix partial HW dithered refreshes sometimes appearing to shift refreshed content (#6267)

* Fix HW dithered partial refreshes sometimes behaving as if the refreshed
content had moved a few pixels to the side...

Probably a kernel issue with the alignment fixup in the EPDC?

* Get rid of the legacy coordinates fixup

It shouldn't be necessary anymore.
And I'd rather fix the root cause, anyway.

* Bump base

(https://github.com/koreader/koreader-base/pull/1116)

* Missed a few DIVs in #6224

frontend/ui/widget/notification.lua

@@ -53,7 +53,7 @@ function Notification:init()
     self[1] = CenterContainer:new{
         dimen = Geom:new{
             w = Screen:getWidth(),
-            h = Screen:getHeight()/10,
+            h = math.floor(Screen:getHeight() / 10),
         },
         FrameContainer:new{
             background = Blitbuffer.COLOR_WHITE,