fix: remove reference to localhost in production env

[asherlloyd]

Description

Remove erroneous reference to localhost in the production .env file.

Reason

The .env file used for deployment contained a reference to localhost that was causing API requests to fail.

How this has been tested

Locally via the project build.

Types of changes

• [ ] New feature (adds functionality)
• [x] Bug fix (fixes an issue)
• [ ] Breaking changes (causes defects to existing pieces)

Screenshots

N/A

Checklist:

• [x] I have read and complied with the CONTRIBUTING document
• [x] The changes I've made follow the existing code style and formatting requirements
• [ ] My changes require updates to the documentation, which I have modified accordingly