Update app.py

app.py

@@ -272,6 +272,9 @@ with gr.Blocks(theme='pikto/theme@>=0.0.1,<0.0.3') as pan:
         slr_bg_threshold.change(change_background_threshold, inputs=[slr_bg_threshold, matting_state],
                             outputs=[matting_state])
 
+        slr_fg_threshold.change(change_foreground_threshold, inputs=[slr_fg_threshold, matting_state],
+                            outputs=[matting_state])
+
         slr_erode_size.change(change_erode_size, inputs=[slr_erode_size, matting_state],
                           outputs=[matting_state])