Fixed wide floaters in the nordic skin.

It is necessary for the timesheet entry floater to be wider because the
input fields are wider. Otherwise the textareas are misplaces. See
http://forum.kimai.org/index.php?topic=1945.msg7739#msg7739
Merge pull request #442 from ServiusHack/nordic_skin_floater_too_thin

Fixed wide floaters in the nordic skin.