Use client error 74 for warehouse placement during a bane

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/net/client/handlers/PlaceAssetMsgHandler.java

@@ -538,7 +538,7 @@ public class PlaceAssetMsgHandler extends AbstractClientMsgHandler {
         bane = cityObject.getBane();
 
         if (bane != null) {
-            PlaceAssetMsg.sendPlaceAssetError(origin, 1, "Cannot place a warehouse during an active bane.");
+            PlaceAssetMsg.sendPlaceAssetError(origin, 74, "");  //"Only buildings of war may be placed during a bane"
             return false;
         }