Adjust t4013 tests to corrected format-patch.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/t/t4013/diff.format-patch_--attach_--stdout_initial..master^ b/t/t4013/diff.format-patch_--attach_--stdout_initial..master^
index 3d57510..a9d1cd3 100644
--- a/t/t4013/diff.format-patch_--attach_--stdout_initial..master^
+++ b/t/t4013/diff.format-patch_--attach_--stdout_initial..master^
@@ -72,6 +72,7 @@
 --------------g-i-t--v-e-r-s-i-o-n
 Content-Type: text/plain; charset=UTF-8; format=fixed
 Content-Transfer-Encoding: 8bit
+
 ---
  dir/sub |    2 ++
  file1   |    3 +++