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
Merge commit 'bf9819aeb8801007d21cf041009ebe557b65b668' into jb-mr1