revert obsolete-page.js

packages/app/src/server/models/obsolete-page.js

@@ -664,6 +664,7 @@ export const getPageSchema = (crowi) => {
 
     pageData.revision = newRevision;
     pageData.lastUpdateUser = user;
+    pageData.updatedAt = Date.now();
 
     return pageData.save();
   }