macos 断点续考进来，摄像头启动较慢，首次抓拍延迟到15秒

src/features/OnlineExam/Examing/ExamingHome.vue

@@ -156,7 +156,7 @@ export default {
         } else {
           initSnapshotTrialTimes++;
         }
-      }, 5 * 1000);
+      }, 15 * 1000);
 
       //       let initSnapshotTrialTimes = 0;
       // const initSnapshot = setTimeout(() => {