[2/2] OmniGears: remove ActiveDisplay wallpaper

see also https://gerrit.omnirom.org/#/c/6087/

Change-Id: Ia8de23930a83f7f6abed5eaff492f91c7992572e
OmniGears: AD brightness - do your math homework max :)

http://jira.omnirom.org/browse/OMNI-752

Change-Id: Ibb123378c47a6e4c337740c95d5eb4eead4cd4b5
Merge branch 'android-4.4' of https://github.com/omnirom/android_packages_apps_OmniGears into android-4.4