Only fetch homedir once, not every time we list a background as homedir shouldn't change.
Only fetch homedir once, not every time we list a background as homedir
shouldn't change.


SVN revision: 23161

FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tasn/enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,FlorentRevest/Enlightenment