Add background image for work challenge

If the challenge shown is for a work profile, add the default image and
color to the background of the fragment.

Change-Id: I148c6cd3a835a84c7bac78b020839dfdae4a6c36

src/com/android/settings/ChooseLockGeneric.java

@@ -172,7 +172,7 @@ public class ChooseLockGeneric extends SettingsActivity {
                     !mLockPatternUtils.isSeparateProfileChallengeAllowed(targetUser)) {
                 // Always use parent if explicitely requested or if profile challenge is not
                 // supported
-                mUserId = Utils.getSameOwnerUserId(getContext(), getArguments());
+                mUserId = Utils.getUserIdFromBundle(getContext(), getArguments());
             } else {
                 mUserId = targetUser;
             }