fix: clean-up token autodetection

[salimtb]

Explanation

clean up PR for token autodetection controller

References

Changelog

@metamask/assets-controllers

• CHANGED: change some variables names

Checklist

• [ ] I've updated the test suite for new or updated code as appropriate
• [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• [ ] I've highlighted breaking changes using the "BREAKING" category above as appropriate
• [ ] I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes