fix lint error

src/server/util/swigFunctions.js

@@ -1,7 +1,6 @@
 module.exports = function(crowi, req, locals) {
   const debug = require('debug')('growi:lib:swigFunctions');
   const stringWidth = require('string-width');
-  const entities = require('entities');
 
   const { pathUtils } = require('growi-commons');