overlay: config: raise brightness in the middle, way lower in pitch black

Raise the middle section by ~30-40 lux.
Now, the lowest control point is 2 (1 doesn't work: flickering)
which gives 4-6 lux on output.
Put the screenBrightnessDim back to 10 now that the DisplayPowerController
takes "current brightness value" into account when dimming.


Bug: 7275578, 7290588, 7295909
Change-Id: Idcadbf3b6aeef6f10dec4522cf31cabb6132369e
1 file changed