fix:实时监控台缓存页面问题

src/features/invigilation/RealtimeMonitoring/RealtimeMonitoring.vue

@@ -670,7 +670,7 @@ export default {
   beforeRouteEnter(to, from, next) {
     next((vm) => {
       if (["WarningDetail", "VideoCommunication"].includes(from.name)) {
-        vm.pageType = vm.cachePaperType;
+        vm.pageType = vm.cachePaperType || "0";
         if (vm.curExamBatch.isExaming) {
           vm.loopRunning = true;
           vm.timerUpdatePage();