[TASK] Style select field of BackendUtility::getFuncMenu

The select field of BackendUtility::getFuncMenu must be styled by
the class "form-control".

One example can be found in the template module if multiple
template records are saved on one page.

Resolves: #79417
Releases: master
Change-Id: I84967474aadbd88bd844fe3cb7de0245abebd39f
Reviewed-on: https://review.typo3.org/51384


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