Torbutton doesn't update the circuit display when the back button is pressed

Don't know if the code for the circuit display will get rebuilt from new after the new UX refresh, but if it's not then this issue may be worth fixing.

1. Open your Tor Browser.
2. Open https://tails.boum.org/
3. On the same tab type https://rbm.torproject.org/ and press enter.
4. Click on the back button.
5. Click on Torbutton, circuit display shows information about torproject.org circuit and doesn't refresh itself to show the information for the actual page the tab is in.