Dav: fixed Location in successful MKCOL response.

Instead of reducing URI length to not include the terminating '\0'
character in 6ddaac3e0bf7, restore the terminating '/' character.

src/http/modules/ngx_http_dav_module.c

diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index 95c7b32..105a607 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c
@@ -513,7 +513,6 @@
     }
 
     *(p - 1) = '\0';
-    r->uri.len--;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http mkcol path: \"%s\"", path.data);
@@ -521,6 +520,8 @@
     if (ngx_create_dir(path.data, ngx_dir_access(dlcf->access))
         != NGX_FILE_ERROR)
     {
+        *(p - 1) = '/';
+
         if (ngx_http_dav_location(r, path.data) != NGX_OK) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;
         }