Fix code that clears a CPU affinity mask.

[philburk]

We have to set bits on for each CPU.
See solution in OboeStreamCallbackProxy::applyCpuAffinityMask, not yet merged as of 2023-08-05.

[philburk]

Oboe PR at google/oboe#1901

Code here

[philburk]

Lowering priority for this because we do not change CPU affinity on the fly.