fix(map): 简化英雄列表等级节点的显示逻辑

移除冗余的分支判断，仅根据等级字符串直接匹配显示对应节点，同时隐藏了多余的light和bg节点

assets/script/game/map/HerosListComp.ts

@@ -219,13 +219,9 @@ export class HerosListComp extends CCComp {
         const cardLvStr = `lv${hero.pool_lv ?? 1}`
         this.lv_node.active = true
         this.lv_node.children.forEach(child => {
-            if (child.name === "light") {
-                child.active = false
-            } else if (child.name === "bg") {
-                child.active = true
-            } else {
-                child.active = (child.name === cardLvStr)
-            }
+           
+            child.active = (child.name === cardLvStr)
+            
         })
         const widget = this.lv_node.getComponent(Widget)
         if (widget) widget.updateAlignment()