[pitivi] Make schema backwards compatible with Gtk3.10

[Thibault Saunier <tsaunier src gnome org>]

commit 85560d03cfe2916f3024b9d894a6eca4464b2c10
Author: Lubosz Sarnecki <lubosz gmail com>
Date:   Wed Sep 24 14:20:34 2014 +0200

    Make schema backwards compatible with Gtk3.10

 pitivi/utils/ui.py |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/utils/ui.py b/pitivi/utils/ui.py
index 70c45f2..62499ec 100644
--- a/pitivi/utils/ui.py
+++ b/pitivi/utils/ui.py
@@ -95,7 +95,11 @@ LAYER_CONTROL_TARGET_ENTRY = Gtk.TargetEntry.new("pitivi/layer-control", 0, TYPE
 def _get_settings(schema):
     if schema not in Gio.Settings.list_schemas():
         return None
-    return Gio.Settings(schema_id=schema)
+    try:
+        return Gio.Settings(schema_id=schema)
+    except TypeError:
+        # Gtk 3.10
+        return Gio.Settings(schema=schema)
 
 
 def _get_font(font_spec, default):