[pitivi] curve.py: remove crack copied over from preview.py

[Edward Hervey <edwardrv src gnome org>]

commit 334d31b5ca486b45866326fe146f75ac886b4e0b
Author: Brandon Lewis <brandon_lewis alum berkeley edu>
Date:   Thu Nov 5 16:17:26 2009 -0800

    curve.py: remove crack copied over from preview.py

 pitivi/ui/curve.py |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/pitivi/ui/curve.py b/pitivi/ui/curve.py
index 8c8643e..96e5029 100644
--- a/pitivi/ui/curve.py
+++ b/pitivi/ui/curve.py
@@ -153,9 +153,7 @@ class Curve(goocanvas.ItemSimple, goocanvas.Item, View, Zoomable):
 
 ## element callbacks
 
-    def _set_element(self):
-        self.previewer = previewer.get_preview_for_object(self.element)
-    element = receiver(setter=_set_element)
+    element = receiver()
 
     @handler(element, "in-point-changed")
     @handler(element, "media-duration-changed")