[BUGFIX] Set title for select icons

Use the select options label as title instead of
an uninitialized variable.

Resolves: #79037
Releases: master, 7.6
Change-Id: I690b687f5dd854556ac799d89c8462f4ce9966a4
Reviewed-on: https://review.typo3.org/50997


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>