webdavapi: fix 'resourcetype' property check

frontend/apps/cloudstorage/webdavapi.lua

@@ -105,7 +105,7 @@ function WebDavApi:listFolder(address, user, pass, folder_path, folder_mode)
             local item_fullpath = item:match("<[^:]*:href[^>]*>(.*)</[^:]*:href>")
             local item_name = FFIUtil.basename(util.htmlEntitiesToUtf8(util.urlDecode(item_fullpath)))
             local is_current_dir = item_name == string.sub(folder_path, -#item_name)
-            local is_not_collection = item:find("<[^:]*:resourcetype/>") or
+            local is_not_collection = item:find("<[^:]*:resourcetype%s*/>") or
                                       item:find("<[^:]*:resourcetype></[^:]*:resourcetype>")
             local item_path = path .. "/" .. item_name