Config wizard: "Edit advanced config" checkbox reappears unchecked on the advanced-options step of Update wizzard

[nuschpl]

Environment: rclone-webui-react via rclone rcd --rc-web-gui, rclone v1.74.0-DEV, browser Firefox.

Steps to reproduce

1. Click Update on a remote.
2. After the standard options, tick Edit advanced config? and continue.
3. On the next step the advanced options are shown — but the "Edit advanced config" checkbox is shown again, now unchecked, among them.

Expected

Once you've opted into advanced options and are viewing them, the opt-in toggle shouldn't reappear unchecked — it implies advanced editing is now off while you're editing advanced fields.

Actual

The unchecked checkbox reappears alongside the advanced options, which is confusing.

Proposed fix

On the advanced step, either hide the "Edit advanced config" toggle, or render it checked/disabled to reflect the active state.