BugFix: determine path in pageShow action

lib/routes/page.js

@@ -586,7 +586,7 @@ module.exports = function(crowi, app) {
   }
 
   actions.pageShow = function(req, res) {
-    const path = path || getPathFromRequest(req);
+    const path = getPathFromRequest(req);
 
     // FIXME: せっかく getPathFromRequest になってるのにここが生 params[0] だとダサイ
     const isMarkdown = req.params[0].match(/.+\.md$/) || false;