Fix comparison with True in SQLAlchemy query

Author: mitya57

sphinxcontrib/websupport/storage/sqlalchemy_db.py

@@ -51,7 +51,7 @@ def nested_comments(self, username, moderator):
 
         # Filter out all comments that are not moderated yet.
         if not moderator:
-            q = q.filter(Comment.displayed is True)
+            q = q.filter(Comment.displayed == True)  # noqa: E712
 
         # Retrieve all results. Results must be ordered by Comment.path
         # so that we can easily transform them from a flat list to a tree.