Remove ThunarVFS item from the TODO list.

TODO

-Important for Thunar 1.0
+Important for Thunar 1.2
 ========================
 
- - Check getmntinfo() or getfsstat() for ThunarVfsVolumeManagerBSD, which
-   might be faster than several statfs() calls.
-
  - The layouting code for ThunarLocationButtons is still buggy. Problem shows
    with paths that include a very long directory; you cannot scroll to the
    last path component then.