Refactor our colors to rely on the Theme more

We should try to use Theme.DeviceDefault wherever possible, to
allow easier customization.

One artifact that this fixes is the Preference Categories being blue
on the polestar bench while the switches are orange.

Fixes: 143958063
Test: Manually
Change-Id: Ia8f127eba1b94bd93da7f24a845f2eb1e6aa0ea6
11 files changed