fix math bug in setMouseOffset due to wrong parentheses (compare to the virtualMouse.x = ... line to confirm that there is a bug here -- the two locations perform the math differently from each other. or just launch the example - the text displays have nonsensical outputs)
comment out setMouseOffset/setMouseScale to match original and avoid confusing output (when I ran it for the first time, these lines made the output display very confusing to me)
Fix core_window_letterbox.nim to more closely mirror the original (https://github.com/raysan5/raylib/blob/master/examples/core/core_window_letterbox.c)
virtualMouse.x = ...line to confirm that there is a bug here -- the two locations perform the math differently from each other. or just launch the example - the text displays have nonsensical outputs)