[BUGFIX] Module menu link wrap

Makes module links in menu on the left not wrap around in small frames.

Change-Id: Ib7168ac0d2111aab7c7c8510d6f36243683ce11c
Fixes: #32448
Releases: 4.5, 4.6, 4.7
Reviewed-on: http://review.typo3.org/7207
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Stefan Neufeind
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter