test(mts): fix tests mock

packages/component-manuscript-manager/src/tests/fragments/post.test.js

@@ -10,6 +10,7 @@ jest.mock('pubsweet-component-mail-service', () => ({
   sendNotificationEmail: jest.fn(),
   sendSimpleEmail: jest.fn(),
 }))
+jest.mock('pubsweet-component-mts-package')
 const reqBody = {}
 
 const path = '../routes/fragments/post'