Set multisession to false

public-apps/sd_controlnet.livemd

@@ -1,4 +1,4 @@
-<!-- livebook:{"app_settings":{"access_type":"public","auto_shutdown_ms":5000,"multi_session":true,"output_type":"rich","show_source":true,"slug":"controlnet"},"file_entries":[{"name":"scribble_bird.png","type":"attachment"}]} -->
+<!-- livebook:{"app_settings":{"access_type":"public","auto_shutdown_ms":5000,"multi_session":false,"output_type":"rich","show_source":true,"slug":"controlnet"},"file_entries":[{"name":"scribble_bird.png","type":"attachment"}]} -->
 
 # SD ControlNet