Fix potential crash for sample D3D12nBodyGravity

[hhl07]

Array renderContextFenceValues[ThreadCount] has only one element. D3D12nBodyGravity::WaitForGpu() accesses the second element of array renderContextFenceValues[ThreadCount] when m_frameIndex is 1. This logic is wrong, m_renderContextFenceValue would be the right fence value to be waited.

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[hhl07]

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