fix: make both icons on add passkey modal the same color

[linnall]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

Test Plan

Before: mismatched colors

After: icons are both blue

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PR-Codex overview

This PR focuses on updating the SVG elements in the passkeys.tsx file to replace the fill attribute with the color attribute for various passkey shield components.

Detailed summary

• Changed fill to color for the following components:
  • PasskeyShieldFilledLight
  • PasskeyShieldFlatLight
  • PasskeyShieldOutlineDark
  • PasskeyShieldFilledDark
  • PasskeyShieldFlatDark

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Name	Status	Preview	Comments	Updated (UTC)
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