Security bulletins should use the given speaking url path

Thomas Löffler reported an issue

In the security bulletins the speaking url path is set, but not used for linking on detail page

Reported URL:https://new.typo3.org/help/security-bulletins/

User Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:57.0) Gecko/20100101 Firefox/57.0