fix: drop the app argument when calling storage:ensure-directory from remote client

Closes #5464

contrib/dokku_client.sh

@@ -147,6 +147,7 @@ main() {
 
   [[ " apps certs help ls nginx shell storage trace version " == *" $CMD "* ]] && unset APP
   [[ " certs:chain domains:add-global domains:remove-global domains:set-global ps:restore " == *" $CMD "* ]] && unset APP
+  [[ " storage:ensure-directory " == *" $CMD "* ]] && unset APP
   [[ "$CMD" =~ events*|plugin*|ssh-keys* ]] && unset APP
   [[ -n "$APP_ARG" ]] && [[ "$APP_ARG" == "--global" ]] && unset APP
   [[ -n "$@" ]] && [[ -n "$APP" ]] && app_arg="--app $APP"