ANW-1843 Exclude URIs from EAD export

[thimios]

Description

Related JIRA Ticket or GitHub Issue

ANW-1843

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have read the CONTRIBUTING document.
• I have authority to submit this code.
• I have added tests to cover my changes.
• All new and existing tests passed.

[brianzelip]

@thimios two small spec followups; only the backend/spec/export_ead_spec.rb change is necessary, but the frontend spec could probably stand to be changed as well.

addressed