Fix: CmBatteryMiniIcon slower animation after fixing issue 3144

The animation was way too fast, after we switched from full 10%->100%
animation to battery-level -> 100% animation. This looked especially
anoying at high battery levels. 750ms for the duration seems to be a
good value. It takes a while when battery is totally empty now, but at
least you dont get seizures if its at high values.

Change-Id: I3d971633cc75e5d59d7718369717e2f7ff3dfc42