synchronize GtkQTreeModel and GtkQSortFilterTreeModel APIs

The GtkQTreeModel API was changed to allow displaying other columns.
This implements the same changes in GtkQSortFilterTreeModel.

Change-Id: I9efb8b6369661816df9cbd81583754b3b073e959
Tuleap: #736
diff --git a/src/contactsview.cpp b/src/contactsview.cpp
index 0be3115..045839b 100644
--- a/src/contactsview.cpp
+++ b/src/contactsview.cpp
@@ -477,7 +477,7 @@
     GtkQSortFilterTreeModel *contact_model = gtk_q_sort_filter_tree_model_new(
         priv->q_sorted_proxy->model(),
         1,
-        Qt::DisplayRole, G_TYPE_STRING);
+        0, Qt::DisplayRole, G_TYPE_STRING);
     gtk_tree_view_set_model(GTK_TREE_VIEW(self), GTK_TREE_MODEL(contact_model));
 
     /* photo and name/contact method column */