Incorrect Y position for custom options in server sandbox option menu

[omiyomy]

When a large amount of custom sandbox options are added by a mod, it's possible for some of the sandbox option controls and labels to fail to set their Y position correctly:

 

This occurs because the labels and controls created in `ISServerSandboxOptionsUI:createPanel` do not have `keepOnScreen` set and have no parent at the time `setY` is called (see logic in `ISUIElement:setY`). The Y is being inappropriately limited to the screen size.

Edited October 14, 2023 by omiyomy
clarification