[TASK] Impexp Move generation of selector boxes to Fluid template

Select box generation has been handed over to Fluid view helper.

Resolves: #72741
Releases: master
Change-Id: I3908cf45cefdac4284b5e89a54eb591a43cb1df1
Reviewed-on: https://review.typo3.org/45958


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>