fix: 修复条件判断语句的格式错误

src/components/pages/pptEasy/addCourse3.vue

@@ -2857,7 +2857,8 @@ export default {
       let url = 'https://beta.pbl.cocorobo.cn'
       if (this.isBetaEnv()) {
         url = url
-      }if (this.lang.lang === 'cn') {
+      }
+      else if (this.lang.lang === 'cn') {
         url = 'https://pbl.cocorobo.cn'
       }
       else if (this.lang.lang === 'hk') {