[pitivi] undo: disconnect correct handlers when layer is removed.

[Thibault Saunier <tsaunier src gnome org>]

commit 1e3145d886cfb455939b3e8b0dd7bcfb7e504ce2
Author: Mathieu Duponchelle <mathieu duponchelle opencreed com>
Date:   Fri May 2 12:44:41 2014 +0200

    undo: disconnect correct handlers when layer is removed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739251

 pitivi/undo/timeline.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pitivi/undo/timeline.py b/pitivi/undo/timeline.py
index 6bb5a12..086b833 100644
--- a/pitivi/undo/timeline.py
+++ b/pitivi/undo/timeline.py
@@ -385,5 +385,5 @@ class TimelineLogObserver(object):
         layer.connect("clip-removed", self._clipRemovedCb)
 
     def _layerRemovedCb(self, timeline, layer):
-        layer.disconnect_by_func(self._layerAddedCb)
-        layer.disconnect_by_func(self._layerRemovedCb)
+        layer.disconnect_by_func(self._clipAddedCb)
+        layer.disconnect_by_func(self._clipRemovedCb)