Symfony version(s) affected: ^5.1.9

Description

#38614 introduce a BC when using URL rewriting and that the URI contains the same string as the subdomain.

How to reproduce

1. Setup URL rewriting from domain.com/index.php/api to api.domain.com
2. Add a route containing /api/ (for example @Route("/foo/api/bar"))
3. Go to api.domain.com/foo/api/bar, you will have a 404

Possible Solution

Change the if in the PR to not change $basename when the URI contains the subdomain where strpos !== 0, basically revert the PR.