Remove the postmarketos-base-ui-gnome-wallpapers subpackage that only
Phosh and GNOME desktop used to depend on, and instead add a hard
dependency on postmarketos-artwork-wallpapers.
The config that enables the wallpapers will be moved to
postmarketos-artwork-wallpapers in the next commit. This will make it
easier to maintain, the paths to the wallpapers will only be in one
package instead of being scattered across many.
Oliver Smith
1712a2d03a