updata：客服管理流程

src/views/PeopleManage/Customer/CustomerServiceAccount.vue

@@ -509,9 +509,9 @@ export default {
         <el-form-item label="客服昵称" prop="nickname">
           <el-input
             v-model.trim="form.nickname"
-            placeholder="请输入2-20个字符"
+            placeholder="请输入2-16个字符"
             clearable
-            maxlength="20"/>
+            maxlength="16"/>
         </el-form-item>
 
         <!-- 客服头像 -->