fix: 修复选择科目和年级时未正确赋值ID的问题

src/components/pages/pptEasy/addCourse3.vue

@@ -1330,8 +1330,8 @@ export default {
     },
     courseSettings(subject, className){
       this.initCourseSettingsOptions();
-      this.selectedSubject = this.subjectOptions.filter(item => item.name === subject);
-      this.selectedGrade = this.gradeOptions.filter(item => item.name === className);
+      this.selectedSubject = this.subjectOptions.filter(item => item.name === subject).map(item => item.id);
+      this.selectedGrade = this.gradeOptions.filter(item => item.name === className).map(item => item.id);
       this.applyCourseSettings();
     },
     // 初始化课程设置选项