Patch for 85966 - renaming desktop icons only works after restart if fam is not installed

[Damon Chaplin <damon ximian com>]

Hi, I've added a small patch to:

  http://bugzilla.gnome.org/show_bug.cgi?id=85966

The .desktop file was being updated fine, and was emitting the "changed"
signal. However it still assumed the old file info was OK so used the
old display name.

The patch invalidates the display name, and works fine for me.
Though I don't know how nautilus_file_invalidate_attributes() is
supposed to be used so I'm only guessing.

Damon