mod_dav: Make sure that when we prepare an If URL for Etag comparison,

we compare unencoded paths. PR 53910

trunk patch: http://svn.apache.org/r1470940
             http://svn.apache.org/r1477530
Submitted by: Timothy Wood <tjw omnigroup.com>
Reviewed by: minfrin, jim, jorton


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1486454 13f79535-47bb-0310-9956-ffa450edef68