[pitivi] prefs: Fix dialog padding

[Alexandru Băluț <alexbalut src gnome org>]

commit 7608ea1f6b9ae258197c08c8332305fb0c06aa80
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Sep 16 19:49:54 2016 +0200

    prefs: Fix dialog padding
    
    Reviewed-by: Jakub Brindza <jakub brindza gmail com>
    Differential Revision: https://phabricator.freedesktop.org/D1319

 pitivi/dialogs/prefs.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/dialogs/prefs.py b/pitivi/dialogs/prefs.py
index 6af224f..181b96a 100644
--- a/pitivi/dialogs/prefs.py
+++ b/pitivi/dialogs/prefs.py
@@ -456,7 +456,6 @@ class CustomShortcutDialog(Gtk.Dialog):
         prompt_label = Gtk.Label()
         prompt_label.set_markup(_("Enter new shortcut for <b>%s</b>,\nor press Esc to "
                                   "cancel.") % customised_item.title)
-        prompt_label.props.margin_top = PADDING * 3
         prompt_label.props.margin_bottom = PADDING * 3
         prompt_label.show()
         self.accelerator_label = Gtk.Label()
@@ -469,6 +468,7 @@ class CustomShortcutDialog(Gtk.Dialog):
         self.conflict_label = Gtk.Label()
 
         content_area = self.get_content_area()
+        content_area.props.margin = PADDING * 3
         content_area.add(prompt_label)
         content_area.add(self.accelerator_label)
         content_area.add(self.conflict_label)