fix(接口测试): 修复引用的xpath断言未加操作控制问题

--bug=1027963 --user=赵勇 【接口测试】场景详情-引用的场景和CASE-断言xpath可下拉切换类型 https://www.tapd.cn/55049933/s/1394859

Signed-off-by: fit2-zhao <yong.zhao@fit2cloud.com>

api-test/frontend/src/business/definition/components/assertion/ApiAssertionsEdit.vue

@@ -27,7 +27,8 @@
     <div class="assertion-item-editing x_path" v-if="assertions.xpath2.length > 0">
       <div>
         XPath
-        <el-select v-model="assertions.xpathType" size="mini" v-loading="loading" @change="reload">
+        <el-select v-model="assertions.xpathType" size="mini" v-loading="loading" @change="reload"
+                   :disabled="isReadOnly && !assertions.document.label">
           <el-option v-for="item in options" :key="item.value" :label="item.label" :value="item.value"></el-option>
         </el-select>
         <el-tooltip placement="top">

api-test/frontend/src/business/definition/components/extract/ApiExtractEdit.vue

@@ -35,7 +35,7 @@
     <div class="extract-item-editing xpath" v-if="extract.xpath.length > 0">
       <div>
         XPath
-        <el-select v-model="extract.xpathType" size="mini" v-loading="loading" @change="reload">
+        <el-select v-model="extract.xpathType" size="mini" v-loading="loading" @change="reload" :disabled="isReadOnly">
           <el-option v-for="item in options" :key="item.value" :label="item.label" :value="item.value"></el-option>
         </el-select>
         <el-tooltip placement="top">