[BUGFIX] Show active state for SelectIcons

Highlight the selected icon. This useful feature has been
removed with the FormEngine rewrite.

Resolves: #83781
Releases: master, 8.7
Change-Id: I06376b073585d39d14de6f40bd02172168425944
Reviewed-on: https://review.typo3.org/55568


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>