privacy guard: Fix crash when uninstalling an app

 * Don't try to update the privacy guard flag while refreshing after an
   uninstall since the PM will throw an exception at us.

Change-Id: Idadb99fefc2861e871f6206b08c844dda742fa68
Revert "No back icon in action bar of APN Settings"

This reverts commit 5e74774776e99e868ec2270d498a122f9d2bf8a2.