This allows Settings to test against the latest framework changes.
Also replaced TestConfig with traditional robolectric.properties.
Bug: 73173204
Bug: 73892008
Test: make -j56 RunSettingsRoboTests
Change-Id: I3135b4fa5f095ba79b282a76f45dd9baa2584bc7
Check whether the wallpaper picker is enabled in
WallpaperPreferenceController.isAvailable() instead of always returning
true.
Bug: 63939450
Test: make RunSettingsRoboTests
Change-Id: Ie3a4a68b728ccab1a7aa50c0018a5153907c49b4