[gtranslator] Fix crash introduced in previous patch

[Ignacio Casal Quinteiro <icq src gnome org>]

commit c550a45730c151b18e86c33521550097a6ab77b5
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Fri Apr 6 23:55:13 2012 +0200

    Fix crash introduced in previous patch

 src/gtr-header.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/gtr-header.c b/src/gtr-header.c
index 130626e..16f9d85 100644
--- a/src/gtr-header.c
+++ b/src/gtr-header.c
@@ -201,8 +201,10 @@ gtr_header_new (po_message_iterator_t iter, po_message_t message)
 {
   GtrHeader *header;
 
-  header = g_object_new (GTR_TYPE_HEADER, "gettext-iter", iter,
-                         "gettext-msg", message, NULL);
+  header = g_object_new (GTR_TYPE_HEADER, NULL);
+
+  _gtr_msg_set_iterator (GTR_MSG (header), iter);
+  _gtr_msg_set_message (GTR_MSG (header), message);
 
   /* We have to parse the number of plurals */
   parse_nplurals (header);