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

we compare unencoded paths. PR 53910 [Timothy Wood <tjw omnigroup com>]

Backports: r1470940, r1477530
Reviewed by: minfrin, wrowe, rjung



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1497435 13f79535-47bb-0310-9956-ffa450edef68