[BUGFIX] Fix missing closing divs in SelectSingleBoxElement

Under certain conditions closing divs were missing:

1. When all fieldControls are disabled.
2. If the field itself is disabled.

This fixes these cases, so we have correct html at all times.

Resolves: #94535
Releases: master, 10.4
Change-Id: Ieb7670666b6a927e80eb7377770d7f54189bc093
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69808


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>