Update slug

[jingcheng16]

Product Description

I renamed API_USAGE to API_KEYS in #35622 but missed the update in enterprise/view.py. This PR is to update the slug.

Technical Summary

Feature Flag

Safety Assurance

Safety story

Put it on staging and verified the Security Center page no longer 500ed.

Automated test coverage

QA Plan

Rollback instructions

• This PR can be reverted after deploy with no further considerations

Labels & Review

• Risk label is set correctly
• The set of people pinged as reviewers is appropriate for the level of risk of the change

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: corehq/apps/enterprise/views.py

Function	Unhandled Issue
security_center	AttributeError: type object 'EnterpriseReport' has no attribute 'API_USAGE' /a/{domain}/... Event Count: 1

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