fix: remove unnecessary calls to purgeCache (#3502)

bridges/TwitterBridge.php

@@ -228,6 +228,7 @@ EOD
 
                 $cache->setScope('twitter');
                 $cache->setKey(['cache']);
+                // todo: inspect mtime instead of purging with 3h
                 $cache->purgeCache(60 * 60 * 3);
                 $api = new TwitterClient($cache);