More state work

src/engine/objects/City.java

@@ -1173,7 +1173,8 @@ public class City extends AbstractWorldObject {
             sourceNation.getSubGuildList().remove(sourceGuild);
 
             if (sourceNation.getSubGuildList().isEmpty())
-                sourceNation.downgradeGuildState();
+                sourceNation.guildState = GuildState.Sovereign;
+
         }
 
         // Link the mew guild with the tree