[pitivi] prefs: Remove unused field

[Alexandru Băluț <alexbalut src gnome org>]

commit 73780891b02bb0be311684a9309222d0c9f2400a
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Sep 16 18:41:00 2016 +0200

    prefs: Remove unused field
    
    Reviewed-by: Jakub Brindza <jakub brindza gmail com>
    Differential Revision: https://phabricator.freedesktop.org/D1318

 pitivi/dialogs/prefs.py |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/dialogs/prefs.py b/pitivi/dialogs/prefs.py
index 7c046a8..6af224f 100644
--- a/pitivi/dialogs/prefs.py
+++ b/pitivi/dialogs/prefs.py
@@ -436,7 +436,6 @@ class CustomShortcutDialog(Gtk.Dialog):
         self.get_titlebar().set_decoration_layout('close:')
         self.add_events(Gdk.EventMask.KEY_PRESS_MASK)
 
-        self.shortcut_changed = False
         self.conflicting_action = None
 
         # Setup the widgets used in the dialog.