[BUGFIX] Call `TBE_EDITOR.fieldChanged()` again

With #93975 the calls to `TBE_EDITOR.fieldChanged()` as onchange handlers
have been removed which was an accidental breaking change.
This patch adds the necessary calls again, which may lead to false
deprecation warnings in the browser's console.

Resolves: #94108
Related: #93975
Releases: master
Change-Id: Ifbae4adb0ff8b931bbdb3fe4d08c14c5aa30f81f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69107


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>