MacGui: widen the preview window's HUD display by 10 pixels.

The info string "Source: 1920x1080, Output: 1920x1080, Anamorphic: 1920x1080 Custom" was being wrapped.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5391 b64f7644-9d1e-0410-96f1-a4d463321fa5