Settings: Remove Wallpaper selection from Display

Let the launcher handle wallpaper selection.

Change-Id: I7f0eb20a5bc01d82fdb98905524b9743fee447c6
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge branch 'cm-11.0' into cm-11.0-sc

Conflicts:
	res/xml/display_settings.xml