[BE][MPS] Remove unused size12 variable

[malfet]

Fixes following compilation warning

/Users/nshulga/git/pytorch/pytorch/aten/src/ATen/native/mps/kernels/Pooling.metal:433:8: warning: unused variable 'size12' [-Wunused-variable]
  auto size12 = input_sizes[1] * input_sizes[2];
       ^
1 warning generated.

[pytorch-bot]

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[dcci]

groovy

[malfet]

@pytorchbot merge -f "Lint + MPS are green"

[pytorchmergebot]

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