fix(pptEasyClass): 修正英文环境的分享链接域名

将原有的en语言判断改为com语言判断，适配对应海外站点的分享链接配置

src/components/pptEasyClass/shareDialog.vue

@@ -86,7 +86,7 @@ export default {
       else if (this.lang.lang === 'hk') {
         url = 'https://cloud.cocorobo.hk'
       }
-      else if (this.lang.lang === 'en') {
+      else if (this.lang.lang === 'com') {
         url = 'https://cloud.cocorobo.com'
       }
       this.form.url = `${url}/admin.html?orgnum=${this.courseId}&classcode=${this.classId}`;