[TASK] Increase default titleLen

UC/titleLen in BE_USER is used to truncate data in the backend.
Increase the default value.

Change-Id: I64e2ecb1a8f4458101bc2bd395ef6c1be0ca667c
Resolves: #30670
Releases: 4.6
Reviewed-on: http://review.typo3.org/5637
Reviewed-by: Markus Klein
Reviewed-by: Dmitry Dulepov
Tested-by: Dmitry Dulepov
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers