Remove usage of app.get_designated_import_handler()

tailbone/views/importing.py

@@ -167,7 +167,7 @@ class ImportingView(MasterView):
         """
         key = self.request.matchdict['key']
         app = self.get_rattail_app()
-        handler = app.get_designated_import_handler(key, ignore_errors=True)
+        handler = app.get_import_handler(key, ignore_errors=True)
         if handler:
             return self.normalize(handler)
         raise self.notfound()