convert : skip bias_vl tensor in DeepSeek-V4 DSpark conversion (#28294)
* convert : skip bias_vl tensor in DeepSeek-V4 DSpark conversion
The DFLASH arch does not include FFN_EXP_PROBS_B_VL, so the DSpark
conversion failed when it tried to write the mtmd-only hash routing
tensor ffn.gate.bias_vl. Drop it like the tid2eid tensor; the DFLASH
draft only consumes ffn.gate.bias via FFN_EXP_PROBS_B.
Assisted-by: pi:llama.cpp/DeepSeek-V4-Flash-0731
* cont : fix
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>