Removes references to invalid domain

[willroberts]

Summary

Build changes (docker/, gulp/, scripts/, etc.):

• Removes references to duelyst.org in the test_cors.sh script.

Testing

Have you have tested your changes in the following scenarios?
Feel free to check off scenarios which don't apply.

• Starting backend services locally with docker compose up succeeds.
• I am able to create a new user and log in locally.
• I am able to complete a practice game locally.
• I am able to complete a purchase of Orbs, etc.