fix: scrypt cannot build on some platform, revert the change library commit

Signed-off-by: BoHong Li <a60814billy@gmail.com>

Author: a60814billy

lib/models/user.js

@@ -1,7 +1,7 @@
 'use strict'
 // external modules
 var Sequelize = require('sequelize')
-var scrypt = require('@mlink/scrypt')
+var scrypt = require('scrypt')
 
 // core
 var logger = require('../logger')

package.json

@@ -109,7 +109,7 @@
     "readline-sync": "^1.4.7",
     "request": "^2.88.0",
     "reveal.js": "~3.7.0",
-    "@mlink/scrypt": "^6.1.2",
+    "scrypt": "^6.0.3",
     "select2": "^3.5.2-browserify",
     "sequelize": "^3.28.0",
     "sequelize-cli": "^2.5.1",