Hot-restart button is lost when connecting to a new web app

[elliette]

Steps to reproduce:

1. Open DevTools for a web app
2. The hot-restart button is visible
3. Copy the VM service URI
4. Click "Connect to a new app" and paste in the exact same VM service URI

Expected behavior: On reconnection, the hot-restart button should still be visible
Actual behavior: On reconnection, the hot-restart button is gone