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* solve 'bin size 257 cannot run on GPU #3339'

https://github.com/microsoft/LightGBM/issues/3339#issuecomment-1665131743



* fix  typo LeafIndex -> leaf_index

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Co-authored-by: shiyu1994 <shiyu_k1994@qq.com>
Co-authored-by: James Lamb <jaylamb20@gmail.com>