Remove lib from the autoload_paths
Remove lib from the autoload_paths

We already require what we need from lib manually.

Furthermore, Zeitwerk complains about lib/factories* not defining
the expected modules, so we need to stop autoloading it in order
to support Rails 6.

StemboltHQ/solidus_affirm,StemboltHQ/solidus_affirm,StemboltHQ/solidus_affirm