Don't show plague risk in city view when plague is disabled in the current ruleset

[daavko]

Is your feature request related to a problem? Please describe. Currently, plague risk is always shown in the city view. If plague is disabled, a -.- value is shown with a tooltip "Illness disabled in ruleset". It only takes up space and doesn't give the player any meaningful information.

Describe the solution you'd like I'd expect it to be hidden when plague is disabled in the ruleset.

Describe alternatives you've considered Leaving it as it is. That would be okay, since it's just one line. In my opinion, hiding it when effectively useless would make the game more polished.

Additional context No additional context.