refactor: 代码生成预览界面，复制代码时会触发突然关闭，很不方便，增加配置避免不小心关闭

Signed-off-by: 刘继东 <wwwliujidong@163.com>

ruoyi-ui/src/views/tool/gen/index.vue

@@ -158,7 +158,8 @@
       @pagination="getList"
     />
     <!-- 预览界面 -->
-    <el-dialog :title="preview.title" :visible.sync="preview.open" width="80%" top="5vh" append-to-body class="scrollbar">
+    <el-dialog :title="preview.title" :visible.sync="preview.open" width="80%" top="5vh" append-to-body class="scrollbar"
+               :close-on-click-modal="false">
       <el-tabs v-model="preview.activeName">
         <el-tab-pane
           v-for="(value, key) in preview.data"