Update Settings to use themed Context.getDrawable()

Explicit null theme is passed when using Resources.getDrawable() and
no theme is available, e.g. when using getResourcesForApplication().
This fixes an issue with ic_text_dot theming and helps avoid similar
issues in the future.

BUG: 17648301
Change-Id: I3e97c3490b6f2a55744f567b21284f2935ae9af7
16 files changed