[TASK] Remove not existing exclude from .php_cs configuration

The folder php-openid does not exists anymore in the TYPO3 core.

Resolves: #77721
Releases: master
Change-Id: I1c02b554a240ea2b2c24250a911f112d80fad99e
Reviewed-on: https://review.typo3.org/49689


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>