wayland: Explicitly request mode for both CSD and SSD modes
According to the spec compositors were to assume surfaces are CSD until told otherwise. This means we need to send org_kde_kwin_server_decoration_request_mode in both cases. This fixes libreoffice under kwin, which would remove it's own headers as per the manager's request but not inform kwin leaving it in the even more broken state of having none.
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