class and table schema now conform to JSON

src/engine/devcmd/cmds/AddMobCmd.java

@@ -78,7 +78,7 @@ public class AddMobCmd extends AbstractDevCmd {
             return;
         }
 
-        if (zone.isPlayerCity) {
+        if (zone.isGuildZone) {
             throwbackError(pc, "Cannot use ./mob on Player cities. Try ./servermob instead.");
             return;
         }