Hook mod_proxy's fixup before mod_rewrite's fixup, so that by

mod_rewrite proxied URLs will not be escaped accidentally by
mod_proxy's fixup.

PR: 16368


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@98707 13f79535-47bb-0310-9956-ffa450edef68