When the user pressed + or -, we would set the efivar override, starting from the default of 0. Instead, set an override that starts at the current value. This means that when user has e.g. a configured override of 5 s, and they press +, they get an override of 6 s. I think this is leads to a much smoother experience for a user, who does not necessarilly need to know that we have three levels of overrides, they just want to easily configure the timeout with keys. If they press +, the timeout should increase, and not jump to some low value. Also, once an override has been set via the boot menu, i.e. the efivar is set, do not allow unsetting the efivar from the boot menu. This way we also avoid an unexpected "jump" to whatever the other sources of configuration specify. The user can configure any value with the keys that they want, so we don't need to allow unsetting.
System and Service Manager
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