[TASK] Inherit example color scheme when not set

The styleguide examples were forced into adaptive light dark
mode instead of respecting the current inheritance. We are now
only forcing dedicated modes when the `colorschemes` option of
the CodeViewHelper is set.

Resolves: #104276
Releases: main
Change-Id: Iea2ceb3ad429af97a10902a3e9b4a1be9df7f653
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85038


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Benjamin Kott <benjamin.kott@outlook.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benjamin Kott <benjamin.kott@outlook.com>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>