[BUGFIX] Fix some styling in color picker component

This commit updates some colors in the color picker component. The dark
background is removed from focussed input fields. Also, the input
styling now matches FormEngine styling.

Resolves: #103891
Releases: main
Change-Id: I9a3a9e10c48be0bf49395d388be55cb8c8535693
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84379


Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>