Fixed the automatic update check if the updates are disabled

[zepich]

The new automatic update check we introduced in v0.4 is not working when the update functionality is generally turned off.

The idea is to inform the user about the available update, even if the update functionality is disabled. The user then knows an update is available and can manually check how to update (for example, by pulling the latest Docker image).

If the automatic update check is disabled, the check will not be performed.