Module does not work

I'm not sure where the field_domain_source_url field is supposed to come from. It doesn't seem to be part of the Domain module. I left it out for now, but feel free to add it back if necessary.

Something else I took the liberty to fix: when decorating a service, you're not supposed to extend the original class. You're supposed to implement the service, inject the original class and call it as a service when necessary. By doing this, you don't need to inject all dependencies the parent needs and the class won't break if the constructor of the parent changes.

Hi!

LGFM, thx for your contribution. Can you update your MR and add some related functional tests plz?

field_domain_source_url came from my personal project. I forgot to clean it when I pushed on d.org.