Adjust t4013 tests to corrected format-patch.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/t/t4013/diff.format-patch_--stdout_initial..master^ b/t/t4013/diff.format-patch_--stdout_initial..master^
index 4e87689..03d0f96 100644
--- a/t/t4013/diff.format-patch_--stdout_initial..master^
+++ b/t/t4013/diff.format-patch_--stdout_initial..master^
@@ -48,6 +48,7 @@
 From: A U Thor <author@example.com>
 Date: Mon, 26 Jun 2006 00:02:00 +0000
 Subject: [PATCH] Third
+
 ---
  dir/sub |    2 ++
  file1   |    3 +++