mod_reqtimeout: Fix default rates missing (not applied) in 2.4.39.

PR 63325.

Backport of r1857129 + r1857130 from trunk.
Proposed by: ylavic
Backported by: rjung
Reviewed by: ylavic, rpluem, jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1859376 13f79535-47bb-0310-9956-ffa450edef68