wayland: Don't unset the selected mimetype on drop_reply
gdk_wayland_drop_context_set_status() can't do much else currently besides picking a mimetype (the first one is currently chosen). This may incorrectly unset the mimetype chosen on .receive(), so the transfer is cancelled before it even starts. At the time drop_reply happens, we should have already picked a mimetype along the way, so only cover for accepted=FALSE in order to unset it.
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