Fix bug #55304 with the provided patch, slightly reformatted.

In short: do not validate conditions of a COPY source's parent since
it is not modified during the operation.

* modules/dav/main/mod_dav.c:
  (dav_method_copymove): adjust params to dav_validate_request()


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1506714 13f79535-47bb-0310-9956-ffa450edef68