fix(接口定义): 修复循环控制器内文案显示错误

--bug=1016400 --user=王孝刚 【接口测试】循环控制器内文案显示错误
https://www.tapd.cn/55049933/s/1234920

frontend/src/business/components/api/automation/scenario/component/LoopController.vue

@@ -23,7 +23,7 @@
         <el-row>
           <el-col :span="8">
             <span class="ms-span ms-radio">{{ $t('loop.loops') }}</span>
-            <el-input size="small" v-model="controller.countController.loops" :placeholder="$t('commons.millisecond')" style="width: 200px"/>
+            <el-input size="small" v-model="controller.countController.loops" style="width: 200px"/>
             <span class="ms-span ms-radio">次</span>
           </el-col>
           <el-col :span="8">