spice-widget: fix hotspot position on Wayland/HiDPI
Same as a945a3c2 but for Wayland.
Fixes breakage caused by GTK behavior change in https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/5159.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Same as a945a3c2 but for Wayland.
Fixes breakage caused by GTK behavior change in https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/5159.