Simplify the way to set the maximum log size

We can use the new configuration option in Rails 7.1, so we don't have
to configure it manually.

config/initializers/new_framework_defaults_7_1.rb

@@ -149,9 +149,9 @@ Rails.application.config.active_support.use_message_serializer_for_metadata = tr
 # `config.load_defaults 7.1` does not set this value for environments other than
 # development and test.
 #++
-# if Rails.env.local?
-#   Rails.application.config.log_file_size = 100 * 1024 * 1024
-# end
+if Rails.env.local?
+  Rails.application.config.log_file_size = 100 * 1024 * 1024
+end
 
 ###
 # Enable raising on assignment to attr_readonly attributes. The previous