[BUGFIX] Avoid updating element header in form editor inspector

When changing values in the form editor inspector, their header
content is updated and overridden - as a result the corresponding
type icon in the header suddenly disappears.

Resolves: #97841
Releases: main, 11.5, 10.4
Change-Id: I18bbd668a16a5b350a14cfa565fb5b96ab205fe8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75011


Tested-by: core-ci <typo3@b13.com>
Tested-by: waldhacker <hello@waldhacker.dev>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: waldhacker <hello@waldhacker.dev>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>