fix 签名组件在只读状态下显示修复

 <!--
  * @Date: 2023-03-29 17:44:24
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2024-08-03 20:36:11
+ * @LastEditTime: 2024-08-22 16:09:05
  * @FilePath: /data-table/src/components/SignField/MyComponent.vue
  * @Description: 文件描述
 -->
 <template>
   <div style="width: 100%;">
-    <div v-show="!default_value" ref="wrapperRef" class="esign-wrapper">
+    <div v-show="!default_value && !readonly" ref="wrapperRef" class="esign-wrapper">
       <vue-esign v-if="esignWidth" ref="esign" class="sign-wrapper" :width="esignWidth" :height="esignHeight" :isCrop="isCrop"
         :lineWidth="lineWidth" :lineColor="lineColor" :bgColor.sync="bgColor" />
       <div v-if="show_sign" class="whiteboard">