[pitivi] elements: Fix padding argument for pack_start

[Thibault Saunier <tsaunier src gnome org>]

commit fb2138de76895d5b9083f9d16fecbd894e5f7407
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Nov 21 03:48:08 2014 +0100

    elements: Fix padding argument for pack_start

 pitivi/timeline/elements.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/elements.py b/pitivi/timeline/elements.py
index 646a923..18729d8 100644
--- a/pitivi/timeline/elements.py
+++ b/pitivi/timeline/elements.py
@@ -832,7 +832,7 @@ class KeyframeMenu(GtkClutter.Actor):
         button = Gtk.Button()
         button.set_label("Remove")
         button.connect("clicked", self._removeClickedCb)
-        vbox.pack_start(button, False, False, False)
+        vbox.pack_start(button, False, False, 0)
 
         self.get_widget().add(vbox)
         self.vbox = vbox