Tweak how batch handler is invoked to remove row

also, removes some related logic which now lives in handler

tailbone/views/batch/core.py

@@ -1120,7 +1120,7 @@ class BatchMasterView(MasterView):
         """
         Perform the actual deletion of given row object.
         """
-        self.handler.remove_row(row)
+        self.handler.do_remove_row(row)
 
     def bulk_delete_rows(self):
         """