MacGui: fix the reveal button in the queue.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6659 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: remove redundant "enabled" property in a few view controller. Cosmetics in HBController.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6660 b64f7644-9d1e-0410-96f1-a4d463321fa5