delete accessTokens from user

apps/app/src/server/models/user.js

@@ -69,7 +69,6 @@ const factory = (crowi) => {
     introduction: String,
     password: String,
     apiToken: { type: String, index: true },
-    accessTokens: { type: mongoose.Schema.Types.ObjectId, ref: 'AccessToken' },
     lang: {
       type: String,
       enum: i18n.locales,