Fix PackFarc console command arguments

[copyrat90]

Sky Editor's console has the PackFarc command, but the arguments are invalid.

If Directory.Exists(Arguments(0)) Then
    Await Farc.Pack(Arguments(0), Arguments(1), Integer.Parse(Arguments(2)), Boolean.Parse(Arguments(3)), CurrentFileSystem)
Else
    Console.WriteLine("Directory does not exist: " & Arguments(0))

Arguments(0) is the command name PackFarc itself, NOT the Input Directory.
Input Directory is Arguments(1), Output Filename is Arguments(2), and so on.

~\SkyEditor.ROMEditor.UI.WPF Build 220 $ PackFarc test\lang\us message-us.bin 5 False
Directory does not exist: PackFarc