Always move length string all the way to the right and give all remaining space to...

Always move length string all the way to the right and give all remaining space to the track name. This causes the track name to not be truncated quite as often and in general makes playlist items, both grouped and ungrouped look a hell of a lot better. I do realize that this might cause issues when the arbitrary selection of teh 4 data fields is implemented

git-svn-id: svn+ssh://svn.kde.org/home/kde/trunk/extragear/multimedia/amarok@716808 283d02a7-25f6-0310-bc7c-ecb5cbfe19da