Some fixes for limited notifications

- Count the number of dots, simplifying the logic for calculating extra
padding needed on the shelf
- Limit padding to the total width of the static container so that BTW
dots don't draw into the notch area
- Simplify a lot of the translation logic so that dot icons always
layout in the shelf exactly as they do in the status bar

Test: visual
Bug: 73487572

Change-Id: I9c62dddf33f2d74f263cb5bd029995f8ce4a801d