fix 重复出现承诺书的bug

src/features/OnlineExam/OnlineExamList.vue

@@ -418,7 +418,7 @@ export default {
         });
         return;
       }
-      if (course.showUndertaking) {
+      if (course.showUndertaking && !alreadyChecked) {
         this.logger({ page: "在线考试列表页面", detail: "考生承诺书" });
         const res = await new Promise((resolve, reject) => {
           this.committmentHtmlContent = course.undertaking;