Revert "On exit, don't write to other generations' scoreboard slots"

As we have removed the possibility to re-use used scoreboard slots in r1757031,
we don't need this check anymore.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1757056 13f79535-47bb-0310-9956-ffa450edef68