[BUGFIX] Set `data-formengine-input-name` for disabled text fields

Disabled input fields now contain the `data-formengine-input-name`
attribute. The slug creation is now able to determine disabled fields as
well to take them into consideration.

Resolves: #90141
Releases: master, 9.5
Change-Id: I153a2d8e3e3e67fd6d865bd4e72691c67ab18c3e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63947


Tested-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>