[BUGFIX] Wrong type field lists

The showitem lists in TCA had wrong commas introduced in https://review.typo3.org/#/c/28450/
If all optional fields are added, the list starts with ' ,hidden'

Releases: 6.2
Resolves: #56965

Change-Id: I913abbf342aba0b0a165bd2059551d74df0de40d
Reviewed-on: https://review.typo3.org/28956
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind