fixed import on hasl lock transaction test

Author: Steven Liu

test/model/transaction/HashLockTransaction.spec.ts

@@ -15,12 +15,12 @@
  */
 import {expect} from 'chai';
 import {NetworkType} from '../../../src/model/blockchain/NetworkType';
+import { NetworkCurrencyMosaic } from '../../../src/model/mosaic/NetworkCurrencyMosaic';
 import {AggregateTransaction} from '../../../src/model/transaction/AggregateTransaction';
 import {Deadline} from '../../../src/model/transaction/Deadline';
 import {HashLockTransaction} from '../../../src/model/transaction/HashLockTransaction';
 import {UInt64} from '../../../src/model/UInt64';
 import {TestingAccount} from '../../conf/conf.spec';
-import { NetworkCurrencyMosaic } from '../../../src/model/model';
 
 describe('HashLockTransaction', () => {
     const account = TestingAccount;