[BUGFIX] Use correct max size for fields in TCA

Some fields are using a varchar(255) in the DB but the max size
is defined with 256 in the TCA. Change the TCA to 255 to avoid errors.

Change-Id: Iad09512e98bb9e2fb9b52e32e0f5f4f8d9b49035
Resolves: #69209
Releases: master
Reviewed-on: http://review.typo3.org/42772


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>