[BUGFIX] Unify: TCE input / TCE readonly / input

Unify form input fields with TCE forms input fields with
TCE forms readOnly text.

Change-Id: If17a9477bcedad33745b5e093b338472365a81cf
Resolves: #55599
Releases: 6.2
Reviewed-on: https://review.typo3.org/27269
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack