WinGui: Small tweak to enable burned in for pgs by default in mp4 files. (Adding tracks only for now)

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5353 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Removed extra property.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5354 b64f7644-9d1e-0410-96f1-a4d463321fa5