Revert "replace default wallpaper with 4.0kb black image to save space and remove ugly stains"

This causes some funk with setting backgrounds when switching themes... I wind up having to set it once, rotate my screen (background is black again), and set it again.

This reverts commit 633a6e7fad55a1888143ae71286eba933ad65ed7
Merge "Revert "replace default wallpaper with 4.0kb black image to save space and remove ugly stains"" into jb42