fix 签名组件删除已存在数据时显示默认样式调整

 <!--
  * @Date: 2023-03-29 17:44:24
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2024-06-17 13:19:51
+ * @LastEditTime: 2024-06-17 16:05:58
  * @FilePath: /data-table/src/components/SignField/MyComponent.vue
  * @Description: 文件描述
 -->
@@ -114,6 +114,7 @@ const sign_value = computed(() => {
 const handleReset = () => {
   // 清空画板
   esign.value?.reset();
+  show_sign.value = true;
   show_control.value = true;
   // 删除可能存在的签名
   image_url.value = "";