Fix parsing tests

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/document_parsing/managers.py

@@ -22,7 +22,9 @@ class DocumentPageContentManager(models.Manager):
     def delete_content_for(self, document, user=None):
         with transaction.atomic():
             for document_page in document.pages.all():
-                self.filter(document_page=document_page).delete()
+                self.filter(
+                    document_version_page=document_page.content_object
+                ).delete()
 
             event_parsing_document_content_deleted.commit(
                 actor=user, target=document