fix(picker): updated background-color and border-color

[blunteshwar]

Description

Updated backgroud-color and border-color tokens for picker.
https://jira.corp.adobe.com/browse/SWC-641

How and where has this been tested?

Please tag yourself on the tests you've marked complete to confirm the tests have been run by someone other than the author.

Validation steps

Regression testing

Validate:

1. The documentation pages for at least two other components are still loading, including:

• The pages render correctly, are accessible, and are responsive.

2. If components have been modified, VRTs have been run on this branch:

• VRTs have been run and looked at.
• Any VRT changes have been accepted (by reviewer and/or PR author), or there are no changes.

Screenshots

To-do list

• I have read the contribution guidelines.
• I have updated relevant storybook stories and templates.
• I have tested these changes in Windows High Contrast mode.
• If my change impacts other components, I have tested to make sure they don't break.
• If my change impacts documentation, I have updated the documentation accordingly.
• ✨ This pull request is ready to merge. ✨

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4de7b87

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

File metrics

Summary

Total size: 2.25 MB^*

Package	Size	Minified	Gzipped
picker	28.11 KB	26.84 KB	3.38 KB

picker

Filename	Head	Minified	Gzipped	Compared to base
index-base.css	27.17 KB	25.94 KB	3.30 KB	-
index-theme.css	1.84 KB	1.80 KB	0.57 KB	-
index.css	28.11 KB	26.84 KB	3.38 KB	🟢 ⬇ 0.01 KB
metadata.json	14.89 KB	-	-	🟢 ⬇ 0.03 KB
themes/express.css	1.45 KB	1.41 KB	0.55 KB	-
themes/spectrum-two.css	1.54 KB	1.49 KB	0.56 KB	🟢 ⬇ 0.01 KB
themes/spectrum.css	1.56 KB	1.51 KB	0.57 KB	-

* Size is the sum of all main files for packages in the library.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

[github-actions]

🚀 Deployed on https://pr-3572--spectrum-css.netlify.app

[castastrophe]

This should not be updated as part of the picker PR, please feel free to open a separate PR to address any concerns with the .gitignore