MacGui: disable/enable the encoder options label when needed and fix the encoder preset options when loading a queue item back to the main window.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6354 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: toggle the Advanced tab when the prefs setting changes.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6355 b64f7644-9d1e-0410-96f1-a4d463321fa5