Revert "fb: update wallpaper image"

This reverts commit 2385c7a6ad8e5220b29062cb416560c76d047c9a.
Revert "fb: update default wallpaper"

This reverts commit b619b15d7a3d479a2fbb33816a6bae4120414f38.
fb: set default wallpaper Nexus 4