Re-Expose method to allow clients to grab screensize

[Fuzion24]

I was using this method as follows:

     _,_,width, height = vc.device.getRestrictedScreen()
    w_midpoint = int(int(width)/2)
    h_midpoint = int(int(height)/2)
    vc.device.drag((w_midpoint,h_midpoint),(w_midpoint - 200, h_midpoint), 100)

I would like to make this function public again, so that I can continue to use it. It is not used internally anywhere and is dead code otherwise.