Ignore warped motion for scaled references

tennis.ivf

$ aomdec /tmp/tennis.ivf -o /tmp/tennis.aom.yuv --rawvideo
[..]
$ tools/dav1d -i /tmp/tennis.ivf -o /tmp/tennis.dav1d.yuv
[..]
$ diff -q /tmp/tennis.{aom,dav1d}.yuv
Files /tmp/tennis.aom.yuv and /tmp/tennis.dav1d.yuv differ

Fixed by !868 (merged).

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