UI: Remove Arrows From 2FA Component

[hawkishpolicy]

🗣 Description

The number input field for the 2FA auth adds arrows automatically. This scss formats the input field as a textfield and removes the arrows.

w3schools: https://www.w3schools.com/howto/howto_css_hide_arrow_number.asp

💭 Motivation and context

Closes issue #2261

🧪 Testing

Tested in local environment on Firefox, Chrome, and Safari.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Revert dependencies to default branches.
• Finalize version.

✅ Post-merge checklist

• Create a release.

[Matthew-Grayson]

Tested locally and works as advertised in Firefox, Safari, and Chrome. I also see that this solution is recommended in multiple articles and stackoverflow posts.

My one note is to remove the -moz-appearance line. The appearance line alone removes the arrows for Firefox in my local testing.

For anyone else reviewing this PR you can run the following commands to pull from the forked repo.

git remote add hawkishpolicy git@github.com:hawkishpolicy/crossfeed.git
git fetch hawkishpolicy
git checkout hawkishpolicy/Development

[dmfezzareed]

@schmelz21 I have a request STRY0010699 requesting when the data consumer is taken into the 2FA page, to position the cursor in the text box ready for data entry. Could that be married with this update?

[Matthew-Grayson]

@dmfezzareed That's good input and I can start coding a solution. I suggest we do it in a separate PR because this one is tied to a forked version of Crossfeed that I can't edit. Additionally, let me know if issue #2260 captures your intent.

[schmelz21]

LGTM