[Battery] Update battery fill colors and fill clip

When there is any foreground attribution, this changes the fill to have
no opacity and to use a softer color so that there is still enough
contrast with the foreground.

This change also corrects an incorrect definition for the clip-path
around the battery fill. It was designed to be 0.25dp, but it should
have been 0.5dp.

Test: visual
Bug: 314812750
Fixes: 330707481
Flag: ACONFIG com.android.settingslib.flags.new_status_bar_icons DEVELOPMENT
Change-Id: I5ed8fb6c0da2bc4093130689b6a9bf63ab4b444b