[BUGFIX] TCA Suggest Wizard usable with keyboard

As styling was already there, but just for mouse, and same is true for
selecting results. The keyboard events now trigger the same behaviour.

Change-Id: Ie265f3b5785efc89f7148b8303d9b62c3a5add88
Resolves: #70463
Releases: master, 7.6
Reviewed-on: https://review.typo3.org/47932


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>