An error in initializing with zeors

@kalishor ,

Some of us faced the similar problem and its discussed in this message: Course 1 week 2: bias 'b' value type in model vs initialize_with_zeros

Primarily, in model, we need to update the value of b and w in d(return value) as

     "w" : params["w"],  # from ("w": w)
     "b" : params["b"],   # from("b": b)

Or assign
w, b = params["w"], params["b"]

I think, this change is needed to return the learned weights and biases to the model inference.

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