update app.py forgot .pth after model name

app.py

@@ -20,7 +20,7 @@ effnetb2_2, effnetb2_transforms_2 = create_effnetb2() # we dont need "model.crae
 # load the saved weigths
 effnetb2_2.load_state_dict(
     torch.load(
-        f = "09_pretrained_effnetb2_feature_extractor_20_percent",
+        f = "09_pretrained_effnetb2_feature_extractor_20_percent.pth",
         map_location= torch.device("cpu")
     )
 )