Fix rubocop offense

```ruby
lib/rubocop/cop/factory_bot/association_style.rb:251:21: C: [Corrected] InternalAffairs/RedundantMethodDispatchNode: Remove the redundant send_node.
            ancestor.send_node.method?(:factory) if ancestor.block_type?
```

lib/rubocop/cop/factory_bot/association_style.rb

@@ -248,7 +248,7 @@ def options_for_autocorrect_to_implicit_style(node)
 
         def trait_within_trait?(node)
           factory_node = node.ancestors.reverse.find do |ancestor|
-            ancestor.send_node.method?(:factory) if ancestor.block_type?
+            ancestor.method?(:factory) if ancestor.block_type?
           end
 
           trait_name(factory_node).include?(node.method_name)