fix: 修复作业提交时用户ID获取错误问题

将userid的取值从props.userid改为props.userId，解决用户ID为空的问题

src/views/Student/components/choiceQuestionDetailDialog.vue

@@ -1465,7 +1465,7 @@ const castScreen = (item: any) => {
   isCastScreen.value = true
   addPPTOp2({
     id: props.courseid,
-    userid: props.userid || '',
+    userid: props.userId || '',
     type: '5',
     index: item.id, // 获取当前ppt页面iframe的id
     data: item.id, // 进入作业页面到提交的耗时（秒）