[BUGFIX] Change fe_users DB field size to 255 chars

When having email addresses as usernames the field
fe_users.username gets too small. Resizing to 255
characters solves a lot of problems. Same goes
for the email field.

Releases: master, 6.2
Resolves: #55484
Change-Id: I03e4fe1228a6b22d24ad222a9fab578059917847
Reviewed-on: http://review.typo3.org/35718


Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>