Fix playqueue current track highlight with Mac


git-svn-id: http://cantata.googlecode.com/svn/trunk@5345 b1e49159-3266-923f-9c3e-04f16369770a
Increase (slightly) spacing between track details and slider.


git-svn-id: http://cantata.googlecode.com/svn/trunk@5346 b1e49159-3266-923f-9c3e-04f16369770a
Remove top & bottom margin for mac builds - not required.


git-svn-id: http://cantata.googlecode.com/svn/trunk@5347 b1e49159-3266-923f-9c3e-04f16369770a