xwayland: Fix build options
xwayland: Fix build options

Logs https://hydra.nixos.org/build/146088556/nixlog/7
show `WARNING: Unknown options: "default-font-path, xwayland-eglstream"`
The option names should contain underscores https://gitlab.freedesktop.org/xorg/xserver/-/blob/master/meson_options.txt#L9

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