contrib/dump-asy.pl: Display nicer double-quotes

Long description:

The right way to do this in LaTeX is ``foo'', not "foo".

To apply this patch, use:
curl http://cr.i3wm.org/patch/156/raw.patch | git am

@@ -39,7 +39,7 @@ sub dump_node {

     if (!defined($n->{window})) {

         $type = $n->{orientation} . '-split';

     }

-    my $name = qq|\\"$na\\" ($type)|;

+    my $name = qq|``$na'' ($type)|;

     print $tmp "TreeNode n" . $n->{id} . " = makeNode(";