fix(测试跟踪): 导入缺陷提示信息展示问题

--bug=1025916 --user=宋昌昌 【测试跟踪】缺陷管理-导入缺陷-提示信息建议优化 https://www.tapd.cn/55049933/s/1368824

test-track/frontend/src/business/issue/components/import/IssueImport.vue

@@ -43,15 +43,17 @@
         </el-upload>
       </el-row>
 
-      <el-row>
-        <ul>
-          <li v-for="errFile in errList" :key="errFile.rowNum">
-            {{ errFile.errMsg }}
-          </li>
-        </ul>
+      <el-row style="margin: 10px 0">
+        <el-scrollbar>
+          <ul style="max-height: 60px">
+            <li v-for="errFile in errList" :key="errFile.rowNum">
+              {{ errFile.errMsg }}
+            </li>
+          </ul>
+        </el-scrollbar>
       </el-row>
 
-      <el-row style="text-align: right; margin-top: 40px">
+      <el-row style="text-align: right; margin-top: 30px">
         <el-button size="mini" @click="cancel">{{ $t('commons.cancel') }}</el-button>
         <el-button type="primary" size="mini" @click="save">
           {{ $t('commons.save') }}