python312Packages.insightface: fix passthru.tests

It used to fail with

ModuleNotFoundError: No module named 'mxnet'

+2
+2
pkgs/development/python-modules/insightface/default.nix
··· 7 fetchPypi, 8 insightface, 9 matplotlib, 10 numpy, 11 onnx, 12 onnxruntime, ··· 45 albumentations 46 easydict 47 matplotlib 48 numpy 49 onnx 50 onnxruntime
··· 7 fetchPypi, 8 insightface, 9 matplotlib, 10 + mxnet, 11 numpy, 12 onnx, 13 onnxruntime, ··· 46 albumentations 47 easydict 48 matplotlib 49 + mxnet # used in insightface/commands/rec_add_mask_param.py 50 numpy 51 onnx 52 onnxruntime