fix saveOnHackmd websocket event

lib/routes/hackmd.js

@@ -175,10 +175,9 @@ module.exports = function(crowi, app) {
   const saveOnHackmd = async function(req, res) {
     const page = req.page;
 
-    pageEvent.emit('saveOnHackmd', page);
-
     try {
       await Page.updateHasDraftOnHackmd(page, true);
+      pageEvent.emit('saveOnHackmd', page);
       return res.json(ApiResponse.success());
     }
     catch (err) {