fix a bug during feature copy
fix a bug during feature copy

huanzhang12/lightgbm-gpu,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/lightgbm-gpu,huanzhang12/LightGBM,huanzhang12/LightGBM,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu