Update Settings text styles to use DeviceDefault.

- Replace all TextAppearance.Material styles with the equivalent
TextAppearance.DeviceDefault style
- Reparent Theme.Settings.HomeBase to inherit from Theme.Settings. This
ensures that the correct textAppearance theme attributes are applied
throughout the Settings application.

Bug: 121211932
Test: manually opening Settings and enabling/disabling HotDogOverlay
Change-Id: Ibe4873ed0294de79dbb6aeca464d14c291239c4b