Fixed #32007 -- Fixed queryset crash with Q() annotation and aggregation.

Thanks Gordon Wrigley for the report.

Regression in 8a6df55f2d.

django/db/models/sql/where.py

@@ -159,6 +159,9 @@ class WhereNode(tree.Node):
         clone.relabel_aliases(change_map)
         return clone
 
+    def copy(self):
+        return self.clone()
+
     @classmethod
     def _contains_aggregate(cls, obj):
         if isinstance(obj, tree.Node):