disallow access to local files from disallowed sandboxes
disallow access to local files from disallowed sandboxes

The previous code allowed files loaded from remote locations access to local
files.

mltframework/swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,mltframework/swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec