Don't show updates in demo mode

### What Happened?

Updates show in demo mode including refreshing to check for updates, auto updates etc

### Steps to Reproduce

Boot a live disk in demo mode and check out update options

### Expected Behavior

We should probably:
- [ ] have a special separate item that says updates aren't available in demo mode
- [ ] Make the auto updates switch insensitive

### OS Version

8.x (Early Access)

### Session Type

Classic Session (X11, This is the default)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_