mod_proxy_fcgi: revert r1756187.

rpluem: The default is disablereuse=off and the code you removed makes the
default disablereuse=on.

ylavic: so right..


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1757097 13f79535-47bb-0310-9956-ffa450edef68