fix(pr-threads): 修正留言端點預覽

留言共用 iterator 已改走 timeline，預覽只列一次該端點，避免把端點種類誤報成重複請求。

scripts/pr-threads.js

@@ -51,7 +51,6 @@ export function plannedRequests(repo, index) {
     { method: 'GET', path: pullPath },
     { method: 'GET', path: `/repos/${repo}/issues/${index}/timeline` },
     { method: 'GET', path: `${pullPath}/reviews` },
-    { method: 'GET', path: `/repos/${repo}/issues/${index}/timeline` },
   ];
 }