Fixes autofill coloring in dark mode

[snide]

Summary

Fixes #827

Applies a similar fix as applied to cloud in https://github.com/elastic/cloud/pull/15106 but uses the correct coloring for the text.

Checklist

• This was checked in mobile
• This was checked in IE11
• This was checked in dark mode
• Any props added have proper autodocs
• Documentation examples were added
• A changelog entry exists and is marked appropriately
• This was checked for breaking changes and labeled appropriately
• Jest tests were updated or added to match the most common scenarios
• This was checked against keyboard-only and screenreader scenarios
• This required updates to Framer X components

[cchaos]

This doesn't work for me because the auto-fill background color is too light to see the text:

[snide]

Closing this PR so I can find a better solution.