[MPS] Convert output back to ChannelsLast for MaxPool2D (#94877)
Since we re-stride the indices and output in MPS pooling from ChannelsLast to Contiguous, we need to convert the results back to ChannelsLast.
This will fix the failure with test_memory_format with MaxPool2D in test_modules.py.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94877
Approved by: https://github.com/kulinseth, https://github.com/DenisVieriu97
