Xporter is not working properly with customized cookie

Xporter is not working properly with a customized cookie

Xporter is not able to export images when we have customized cookies.

Steps to reproduce the error:

1. Change the cookie name on your Jira instance (ex.:
   CustomCookie)
2. Create a Test with images on the steps
3. Create a Test Set that will include the previous test
4. Export the Test Set using the template default (Xray Test Set)
5. Images from Test steps won't be rendered.

Expected behavior:

Xporter must be able to export the images with customized cookies