fix(测试跟踪): 修复用例评审关联用例列表页模块数没有刷新的缺陷

--bug=1024438 --user=王孝刚 【测试跟踪】用例评审-关联用例-切换项目关联成功后再次关联-默认项目下数据仍显示其它项目下用例
https://www.tapd.cn/55049933/s/1353738

test-track/frontend/src/business/review/view/components/TestReviewRelevance.vue

@@ -320,6 +320,7 @@ export default {
       if(this.condition.projectId) {
         delete this.condition.projectId;
       }
+      this.projectId = '';
     },
     filter(filters) {
       _filter(filters, this.condition);