vp10: only assume ONLY_4X4 if segmentation is disabled.
Otherwise, per-segment lossless might mean that some segments are not lossless and they could still want to use another mode. The per-block tx points remain uncoded on blocks where (per the segment id) the Q value implies lossless. Change-Id: If210206ab1fe3dd11976797370c77f961f13dfa0
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