Deleted session shows odd error message on login page

### Steps to reproduce

1. Sign into app.element.io and then close tab
2. Sign in to develop.element.io
3. Delete app.element.io session from the settings in develop.element.io
4. Go to app.element.io in a new tab
-> See confusing error message
5. Click "Clear Storage and Sign Out"
-> Get scary warning about deleting keys and an option to cancel

### Outcome

#### What did you expect?
Sign in page, maybe a pop-up dialog saying I've been logged out.

#### What happened instead?
Confusing error message and then another scary message about deleting keys

### Operating system

Arch Linux

### Browser information

Chromium Version 94.0.4606.71 (Official Build)

### URL for webapp

develop.element.io and app.element.io

### Homeserver

matrix.org

### Will you send logs?

Yes