pw: Improve fb allocation code.
Don't set the video size using the data coming from xdp, instead use the data coming from pipewire, which is what matters. Also make sure setVideoSize is called before using the buffer rather than after.
Don't set the video size using the data coming from xdp, instead use the data coming from pipewire, which is what matters. Also make sure setVideoSize is called before using the buffer rather than after.