LibWeb: Apply suggested fixes.

Author: https://github.com/asynts
Commit: 2981f10a5e
Pull-request: https://github.com/SerenityOS/serenity/pull/4318
Reviewed-by: https://github.com/Lubrsi
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Runtime/Object.h

@@ -132,6 +132,7 @@ public:
     virtual bool is_global_object() const { return false; }
     virtual bool is_typed_array() const { return false; }
     virtual bool is_array_buffer() const { return false; }
+    virtual bool is_node_wrapper() const { return false; }
 
     virtual const char* class_name() const override { return "Object"; }
     virtual void visit_edges(Cell::Visitor&) override;