ComfyUI: Fix update script (#9740)

* Update error messages for ComfyUI installation check

* Update comfyui.json

* Change updateable status to true in comfyui.json

* Update comfyui.json

Author: tremor021

ct/comfyui.sh

@@ -24,11 +24,11 @@ function update_script() {
   check_container_storage
   check_container_resources
 
-  if [[ ! -f /opt/${APP} ]]; then
+  if [[ ! -d /opt/ComfyUI ]]; then
     msg_error "No ${APP} Installation Found!"
     exit
   fi
-  msg_error "To update use the ${APP} Manager."
+  msg_error "To update use the ComfyUI Manager."
   exit
 }