Remove another hack from the server. The add_required_filters function

was required to make sure that the sub request had the correct filters
when we went send the error page.  With the new filter insertion logic,
this is no longer necessary.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93710 13f79535-47bb-0310-9956-ffa450edef68