Xcode: small cleanup after libvpx support commit.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6177 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Pre-populate the add preset custom width/height when custom is used.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6178 b64f7644-9d1e-0410-96f1-a4d463321fa5