fixed wrong runtime shape inference for BatchNorm1dToQuantScaleBias

[green-cabbage]

Fixed issue where the output shape of class BatchNorm1dToQuantScaleBias was giving an unexpected shape of [1, input_dim, batch_dim, input_dim] instead of [batch_dim, input_dim].

The issue came from the fact that the class ultimately had a default value of runtime_shape = (1, -1, 1, 1) when it should be runtime_shape = (1, -1) .

We had runtime_shape = (1, -1, 1, 1) because class BatchNorm1dToQuantScaleBias wasn't properly passing down the runtime_shape parameter to class ScaleBias . That issue has been also fixed.

Original issue from https://github.com/Xilinx/brevitas/issues/450