rust_minifb: Scaling not working on XWayland.

Hi. Currently on an X11 system but I’ll try to get more details for you later.

The minifb::Scale option appears to have no effect on Wayland. I also seem to remember seeing an info message saying that only minifb::Scale::X8 and lower is supported. The window starts extremely small.

I believe the system I had the issue on was running Fedora 27, which uses XWayland.