[mxfp8 training] emulated mode test fix - #4396
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Summary
This PR fixes an emulated-mode MXFP8 grouped GEMM failure, which became misaligned in recent PRs related to the new CuteDSL 3d weight quantization kernels.
Tests
pytest test/prototype/moe_training/test_mxfp8_grouped_mm.py -v -s