Apply suggestions from #964 code review

src/utils/proxy/cookie-jar.js

@@ -33,8 +33,7 @@ export function addCookieToJar(url, headers) {
     cookies = [cookie];
   }
 
-  const options = { ignoreError: true };
   for (let i = 0; i < cookies.length; i += 1) {
-    cookieJar.setCookieSync(cookies[i], url.toString(), options);
+    cookieJar.setCookieSync(cookies[i], url.toString(), { ignoreError: true });
   }
 }