fix build error

src/core/execution/PlayerExecution.ts

@@ -121,7 +121,7 @@ export class PlayerExecution implements Execution {
 
   private surroundedBySamePlayer(cluster: Set<TileRef>): false | Player {
     const enemies = new Set<number>();
-    for (const ref of cluster) {
+    for (const tile of cluster) {
       if (
         this.mg.isOceanShore(tile) ||
         this.mg.isOnEdgeOfMap(tile) ||
@@ -130,7 +130,7 @@ export class PlayerExecution implements Execution {
         return false;
       }
       this.mg
-        .neighbors(ref)
+        .neighbors(tile)
         .filter((n) => this.mg.ownerID(n) != this.player.smallID())
         .forEach((p) => enemies.add(this.mg.ownerID(p)));
       if (enemies.size != 1) {