Drop appdomain unlabeled file execute.

Should no longer be required due to restorecon_recursive of /data
by init.rc (covers /data/dalvik-cache and /data/app-lib) and due to
restorecon_recursive of /data/data by installd (covers /data/data
directories).

Change-Id: Icb217c0735852db7cca8583e381264ef8cd8839c
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>