[BUGFIX] Restore altIcons TSconfig option

In #35891 a feature was introduced, which allowed to
override the icon of select items via Page TSconfig.

This feature however did more or less never see the LTS
release, since it was almost completely removed in #67006
again.

Only SelectMultipleSideBySide provided this feature until
https://review.typo3.org/c/Packages/TYPO3.CMS/+/50879/.

It's now restored, using the original configuration path.

Resolves: #73227
Relates: #35891
Releases: master, 10.4
Change-Id: I40e243a6f62a82ddf373b59977b61d00501777fd
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68776


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>