fix(pptEasy): 修正pptIframeUrl中的userid参数名

修复了pptIframeUrl拼接时错误的参数名，将courseid改为userid以正确传递用户ID

src/components/pages/pptEasy/addCourse3.vue

@@ -3302,7 +3302,7 @@ export default {
       } else {
         ppturl = 'https://ppt.cocorobo.cn'
       }
-      this.pptIframeUrl = `${ppturl}/?mode=editor3&courseid=${this.userid}&courseid=${this.cid}`;
+      this.pptIframeUrl = `${ppturl}/?mode=editor3&userid=${this.userid}&courseid=${this.cid}`;
     },
   },
   beforeDestroy() {