[TASK] Improve readability of TextElement code

FormEngine type="text" in class TextElements gets some
code beautification to improve readability.

Resolves: #62040
Releases: master
Change-Id: I219dc1fcabc656aff6eec81066fa7d51ca950d59
Reviewed-on: http://review.typo3.org/33169
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>