`opening a window` chapter need updates for linux wayland

[conradax]

I'm using linux + wayland + vulkan backend.
(Fedora, Gnome)

• In GLFW3 WebGPU Extension part, the glfw3webgpu.c in old glfw3webgpu.zip always fallback to X11 code and make a crash.

  Because _GLFW_WAYLAND is set to private in glfw's src/CMakeLists.txt, so the old glfw3webgpu.c cannot detect wayland.
  I see glfw3webgpu changed a lot. would be nice to update the tutorial with new code

• glfw window won't show up, until finish the later chapter first color.
  (could be the same problem in Build with GLFW Wayland #42)

  this can be reproduced by comment out this line wgpuQueueSubmit(...) in example code of first color.
  could be related: "Wayland will only display the window once a write to the compositor's buffer is actually attempted. When using Vulkan, the Window should only appear after calling VkQueuePresentKhr()"