changed the function signature to be used by PyGTK

mitterlib/ui/helpers/gtk_messagegrid.py

@@ -374,7 +374,7 @@ class MessageGrid(gtk.ScrolledWindow, gobject.GObject):
     # Class methods
     #-----------------------------------------------------------------------
     @staticmethod
-    def delete(self, message):
+    def delete(message):
         """Removes a message from the grid."""
         if not hasattr(message, 'grid'):
             _log.debug('No grid information in the message')