fix: Changed mock response

[KesleyDavid]

Changed id returned in "stock"
This is not a problem that directly affects the core of the application, it is just a "label" update.

   const productId = 2;

   apiMock.onGet(`stock/${productId}`).reply(200, {
      id: 1,
      amount: 1,
   });

To

   const productId = 2;

   apiMock.onGet(`stock/${productId}`).reply(200, {
      id: 2,
      amount: 1,
   });