修改开考逻辑

src/views/home/exam/page-exam.vue

@@ -179,12 +179,13 @@ export default {
           Toast("已考完");
           break;
         case this.examStatesType.STARTED:
+          isCouldExam = true;
+          break;
         case this.examStatesType.STARTEXAMING:
         case this.examStatesType.NOTEXAM:
           Toast("考试已结束");
           break;
         default:
-          isCouldExam = true;
           break;
       }
       if (!isCouldExam) {