hotfix incorrect variable name

app.py

@@ -20,7 +20,7 @@ def process_box(predictor_model, show_mask, radius_width):
     scale           = container_width/width
     scaled_wh = (container_width, int(height * scale))
 
-    if not predictor_model.set_image:
+    if not predictor_model.is_image_set:
         np_image = np.asanyarray(bg_image)
         with st.spinner(text="Extracing embeddings.."):
             predictor_model.set_image(np_image)
@@ -99,7 +99,7 @@ def process_click(predictor_model, show_mask, radius_width):
     scale           = container_width/width
     scaled_wh = (container_width, int(height * scale))
 
-    if not predictor_model.set_image:
+    if not predictor_model.is_image_set:
         np_image = np.asanyarray(bg_image)
         with st.spinner(text="Extracing embeddings.."):
             predictor_model.set_image(np_image)