Elemental demo Lava appears low quality because of motion blur

The flowing lava in the level is a much lower quality than expected the poor quality does not appear to be caused by slow texture streaming, but instead by an over-exagerated or low quality motion blur.

1. Run the Elemental demo
2. let it play until you reach the cut showing the lava (at about 1 min in)
3. enter the 'pause' command once you reach the part with the lava (as seen in screenshots)
   Result:
   once paused the lava's texture quickly returns to a high quality

Fix UE-51650

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