alarm: use unrestrictedSearchResults to getLastActiveProcess

This API is not supposed to take into account security,
unrestrictedSearchResults is usually a bit faster

product/ERP5/Document/Alarm.py

@@ -357,7 +357,7 @@ Alarm Tool Node: %s
       limit = 1
     else:
       limit = self.isActive() and 2 or 1
-    active_process_list = self.getPortalObject().portal_catalog(
+    active_process_list = self.getPortalObject().portal_catalog.unrestrictedSearchResults(
       portal_type='Active Process', limit=limit,
       sort_on=(('creation_date', 'DESC'),
                ('id', 'DESC', 'UNSIGNED'),),