Remove unused variables causing /phone-numbers blank screen error for Admins

[mau11]

Fixes # (issue)

Description

Removes no longer used variables that causes a blank screen error on the /phone-numbers page for Admins users (does not occur for Owners). Also pulled in a styling fix from PR #2457

before

after

Checklist:

• I have manually tested my changes on desktop and mobile
• The test suite passes locally with my changes
• If my change is a UI change, I have attached a screenshot to the description section of this pull request
• My change is 300 lines of code or less, or has a documented reason in the description why it’s longer
• I have made any necessary changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• My PR is labeled [WIP] if it is in progress

[engelhartrueben]

🎉