style(Student): 调整选择题详情对话框的宽度限制

src/views/Student/components/choiceQuestionDetailDialog.vue

@@ -1217,8 +1217,7 @@ onUnmounted(() => {
         gap: .4rem;
 
         &>div {
-          max-width: calc(100% - 200px);
-
+          max-width: calc(100%);
         }
 
         &>span {