Show plugged type (AC / USB) on QS battery tile

Change-Id: I2bd6b2754c2b300931f47a79dfb5e26839f6887a
Load original drawable if cached icon throws NotFoundException

If for some reason we get a NotFoundException while trying to retrieve
a cached icon we will attempt to load the original.

Change-Id: I36a708d3e653fed12e88fe93c6d0a7f8e46726c9