update utils.py for support QDenseBN quant model save

Author: julesmuhizi

qkeras/utils.py

@@ -198,7 +198,7 @@ def model_save_quantized_weights(model, filename=None):
         saved_weights[layer.name]["signs"] = signs
 
       if not any(isinstance(layer, t) for t in [
-          QConv2DBatchnorm, QDepthwiseConv2DBatchnorm]):
+          QConv2DBatchnorm, QDenseBatchnorm, QDepthwiseConv2DBatchnorm]):
         layer.set_weights(weights)
       else:
         print(layer.name, " conv and batchnorm weights cannot be seperately"