Pass "fuse_bn_into_conv" introduces duplicate initializer.

[researcher-no-name]

While fetching RetinaNet of opset=9 from ONNX Model Hub and optimizing it using fuse_bn_into_conv pass, I encounter the following error, related to the model initializer:

onnx.onnx_cpp2py_export.checker.ValidationError: 1133 initializer name is not unique.