Fix battery chip screenshot test instability

This CL contains two changes that fix the battery chip color instability:
1. The colors that are passed into the BatteryMeterView from the BatteryStatusChip are corrected. It should always be black!
2. The BatteryMeterView adjusts its colors automatically when switching the theme from dark to light (and vice versa). A check is added to bypass this automatic color adjustment such that the BatterMeterView always keeps the black color (when it is inside a BatterStatusChip).

Bug: 308605791
Flag: NONE
Test: StatusbarChipsScreenshotTest
Change-Id: I541d282e36a3d4b16de6837fedcc494a671a4ceb