remove unnecessary code

src/server/models/page.js

@@ -301,13 +301,11 @@ module.exports = function(crowi) {
     return false;
   };
 
-  pageSchema.methods.updateTags = async function(newTagsName) {
+  pageSchema.methods.updateTags = async function(newTags) {
     const page = this;
     const PageTagRelation = mongoose.model('PageTagRelation');
     const Tag = mongoose.model('Tag');
 
-    const newTags = [newTagsName]; // [TODO] listing requested Tags on client side
-
     // get tags relate this page
     const relatedTags = await PageTagRelation.find({ relatedPage: page._id }).populate('relatedTag').select('-_id relatedTag');