Don't set the needs-refresh flag when inserting a new file info, since
ewoc refreshes it upon insert already; this makes a full refresh twice
as fast.
Also make git-fileinfo-prettyprint a little faster by not retrieving
permission values twice.
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>