Delete unnecessary /data/data entries.

/data/data subdirectories are labeled by installd at creation time
based on seapp_contexts, not based on file_contexts, so we do not
need the /data/data/.* entry, and the wallpaper file was moved from
under com.android.settings/files to /data/system/users/N long ago so we can
delete the old entry for it.

Change-Id: I32af6813ff284e8fe9fd4867df482a642c728755
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>