Unused variables removed

src/engine/objects/City.java

@@ -48,8 +48,6 @@ public class City extends AbstractWorldObject {
 
     public static long lastCityUpdate = 0;
     public final HashSet<Integer> _playerMemory = new HashSet<>();
-    private final boolean isOpen = false;
-    private final boolean reverseKOS = false;
     public java.time.LocalDateTime established;
     public boolean hasBeenTransfered = false;
     public LocalDateTime realmTaxDate;