Update audi_services.py

[reisfni]

Fixes issue in Home Assistant where device/entities were not populating after adding the integration.

[damienheiser]

I've made the change to my HA and can confirm it works as desired.

[florie1706]

I am in Germany. Old Url still worked, I changed it to the Url of this pull request anyway, but that did not work for me. So I am on the old Url again which still works for me.

[agentadam-code]

WOW this works. Thanks so much.

[oleg-d]

I am in Germany. Old Url still worked, I changed it to the Url of this pull request anyway, but that did not work for me. So I am on the old Url again which still works for me.

Same for me, old URL was working and new one is not. I'm in Finland.

[woopstar]

I am in Germany. Old Url still worked, I changed it to the Url of this pull request anyway, but that did not work for me. So I am on the old Url again which still works for me.

Same for me, old URL was working and new one is not. I'm in Finland.

Same for me in Denmark. Old url works, not new one.

[victorkp]

US user here -- this updated URL works.

We should be switching URLs dependent the user's specified region.

[victorkp]

I've made pull request #211, which only sets the new URL for US users. Non-US users will continue to use the old URL. @reisfni, you should close this PR.