Fix predict function argument order

app.py

@@ -66,7 +66,7 @@ MODELS = [
     NN := "NN Enron1 spam",
 ]
 
-def predict(model, unbiased, intr_threshold, input_txt):
+def predict(model, input_txt, unbiased, intr_threshold):
     if model == BAYES:
         return predict_bayes(input_txt, unbiased=unbiased, intr_threshold=intr_threshold)
     elif model == NN: