about:torconnect no longer changes the title icon on errors

Steps to reproduce

1. Set torbrowser.debug.censorship_level to 1.
2. Load "about:torconnect" and click "Connect".
3. Wait for failure.

Result

The icon next to "Tor Browser could not connect to Tor" remains the same.

Expect

The slash icon.

Regression

Regression from #41621 (closed)