[BUGFIX] tt_content: add rowDescription field even without css_styled_content

rowDescription is now enabled for all core content elements
even if sysext:css_styled_content is not installed. Enable
rowDescription for ext:form and ext:felogin.

Releases: master
Resolves: #71354
Change-Id: Ided838342ebee4c26ec8de434236e39278980fff
Reviewed-on: https://review.typo3.org/44559


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Philipp Gampe <philipp.gampe@typo3.org>
Tested-by: Philipp Gampe <philipp.gampe@typo3.org>