Trace collision audio occlusion is not working on iOS/tvOS

The Left side of the test map works in 4.16 and Main so marking this as a regression.

Tested on iPhone6S+_4982 OS: 10.2.1 and tvOS 10.2

1. Connect headphones to iOS device
2. Launch TM-AnimPhys map form QAGame onto iOS device
3. Navigate to the Occlusion test in the Audio section
4. Walk through the left side of the test area

Result: The audio is never occluded

Expected: The audio is occluded by the white block

Fix UE-51650

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