add linebreak to debug message

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7071 8aca7d54-2c30-db11-9de9-000461428c89
FIX problem with scrollbar offset in line selector of depot window

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7072 8aca7d54-2c30-db11-9de9-000461428c89