Update app.py

Misunderstood docs

app.py

@@ -96,7 +96,8 @@ def detect_objects(model_name,url_input,image_input,threshold):
         else:
             final_str_else += f"Detected `{model.config.id2label[label.item()]}` with confidence `{round(score.item(), 3)}` at location `{box}`\n"
 
-    final_str = "{ABOVE THRESHOLD OR EQUAL:*^50}\n".format("centered") + final_str_abv + "\n{BELOW THRESHOLD:*^50}\n".format("centered")+final_str_else
+    # https://docs.python.org/3/library/string.html#format-examples
+    final_str = "{:*^50}\n".format("ABOVE THRESHOLD OR EQUAL") + final_str_abv + "\n{:*^50}\n".format("BELOW THRESHOLD")+final_str_else
         
     return viz_img, final_str