Set button decorator of update Peppol status to a different method than the cron

The `ModelView.button` decorator requires to be called with a list of records
which the cron does not do.

Closes #14972
(grafted from d3bdcee315895e3fc4a636c14dad5ba592912c59)

--HG--
branch : 8.0

modules/edocument_peppol/edocument.py

@@ -239,13 +239,17 @@ class Peppol(Workflow, ModelSQL, ModelView):
                 self.succeed()
 
     @classmethod
-    @ModelView.button
     def update_status(cls, documents=None):
         if documents is None:
             documents = cls.search([
                     ('direction', '=', 'out'),
                     ('state', '=', 'processing'),
                     ])
+        cls.update_status_button(documents)
+
+    @classmethod
+    @ModelView.button
+    def update_status_button(cls, documents):
         for document in documents:
             document._update_status()
         cls.save(documents)