wayland: Advertise MetaMonitor as wl_output

Merged Olivier Fourdan requested to merge ofourdan/mutter:wl-output-tell-the-truth into master

With the logical size of outputs being handled by xdg-output, we don't need to "lie" to Wayland clients anymore about the output size, so advertise the real mode size as wl_output regardless of the scale, as it should be (and like other Wayland compositors do).


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