[TASK][DB] Increase length of tt_content list_type

Change-Id: Id4c3ba2810c8ec87011cee7650655678d3817550
Resolves: #32471
Releases: 4.7
Reviewed-on: http://review.typo3.org/7222
Reviewed-by: Mario Rimann
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter
Reviewed-by: Christoph Niewerth
Tested-by: Christoph Niewerth
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn