[BUGFIX] Tweet button in configuration module is too narrow

Change-Id: I11eb0c1219ed5cace4fa2a128d36a016b9fa5976
Fixes: #63278
Reviewed-on: http://review.typo3.org/34767
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>