Update app file

app.py

@@ -48,11 +48,11 @@ with col1:
         }
         return option_to_id[option]
     st.write('##')
-    slider = st.radio(
+    radio = st.radio(
         'Or select from example diagrams',
         options = ['factory_pid.png', 'plant_pid.png', 'processing_pid.png'],
         format_func = radio_func,
-        value = 'factory_pid.png',
+        #value = 'factory_pid.png',
     )
 with col3:
     st.markdown('##### Preview')
@@ -60,5 +60,5 @@ with col3:
     if image_file is not None:
         image = Image.open(image_file)
     else:
-        image = sahi.utils.cv.read_image_as_pil(IMAGE_TO_URL[slider])
+        image = sahi.utils.cv.read_image_as_pil(IMAGE_TO_URL[radio])
     st.image(image, use_column_width = True)