[BUGFIX] Remove TCEforms leftovers leading to Exception

TCEforms were removed with #97126 in v12.
Still there was a usage within EditPopup leading to an Exception when
editing a record with FlexForm via edit form control.

Resolves: #104658
Releases: main, 12.4
Change-Id: Ie7110367922a99ca088b416da4c11a025efcde00
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85676


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>