[BUGFIX] EXT:form - Render form name in form tree correctly

Do not double-encode name with HTML entities.

Resolves: #80343
Releases: master
Change-Id: If8e3757f0d34712f0daf03122e61b6ef06a1ccd0
Reviewed-on: https://review.typo3.org/52094


Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>