Themes: setUserRequired(false) when updating audibles

This prevents the following exception
F/Environment(18007): Path requests must specify a user by using UserEnvironment
F/Environment(18007): java.lang.Throwable
F/Environment(18007):   at android.os.Environment.throwIfUserRequired(Environment.java:787)

Change-Id: Ic6ac7537079ed27912c40683c877e05992b708e9
Themes: Allow clearing the wallpaper and ls wallpaper

By providing an empty string for the MODS_LAUNCHER and
MODS_LOCKSCREEN components, the theme service will clear out any
existing wallpaper the user had set.  This provides the same
functionality as if the user was picking "No wallpaper" from the
picker.

AICPfy:
PS1: removed ls updates

Change-Id: I0c349ad4afa2bcef2c302105315709786510c0aa