Don't show updates in demo mode

[danirabbit]

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