fix(测试跟踪): 测试计划关联功能用例页面，数据成显示上一次切换项目后的数据

--bug=1025486 --user=陈建星 【测试跟踪】测试计划-关联功能用例-列表数据仍显示上传一次切换项目的数据 https://www.tapd.cn/55049933/s/1363688

test-track/frontend/src/business/plan/view/comonents/functional/FunctionalRelevance.vue

@@ -215,9 +215,6 @@ export default {
     },
   },
   watch: {
-    selectNodeIds() {
-      this.getTestCases();
-    },
     projectId(val) {
       this.setConditionModuleIdParam();
       this.page.condition.projectId = this.projectId;
@@ -298,6 +295,7 @@ export default {
       this.$refs.table.condition.selectAll = false;
       this.selectNodeIds = nodeIds;
       this.selectNodeNames = nodeNames;
+      this.getTestCases();
     },
     close() {
       this.selectNodeIds = [];