[CLEANUP] Remove hardcoded valign="top" in FormEngine

There are several places in the TYPO3 Form Engine
where the styling information about tables (valign)
is hard-coded.

The patch removes that, styling is done via CSS.

Resolves: #56261
Releases: 6.3
Change-Id: Ibcc9bb7df3cf05e791eae7f16d91e0afa60ab65d
Reviewed-on: http://review.typo3.org/27833
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Marcin Sągol <marcin@soee.pl>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>