Remove scheduled count info for re-engagement emails in listing

We schedule re-engagement emails to be send immediately after we detect some recipients so the scheduled count would be always 0.
[MAILPOET-3782]

assets/js/src/newsletters/listings/re_engagement.jsx

@@ -193,8 +193,6 @@ class NewsletterListReEngagement extends React.Component {
   renderStatus = (newsletter) => {
     const totalSentMessage = MailPoet.I18n.t('sentToXSubscribers')
       .replace('%$1d', newsletter.total_sent.toLocaleString());
-    const totalScheduledMessage = MailPoet.I18n.t('scheduledToXSubscribers')
-      .replace('%$1d', newsletter.total_scheduled.toLocaleString());
 
     return (
       <div>
@@ -212,9 +210,6 @@ class NewsletterListReEngagement extends React.Component {
           >
             { totalSentMessage }
           </Link>
-          {' '}
-          <br />
-          { totalScheduledMessage }
         </p>
       </div>
     );

lib/API/JSON/ResponseBuilders/NewslettersResponseBuilder.php

@@ -164,9 +164,6 @@ class NewslettersResponseBuilder {
       $data['segments'] = $this->buildSegments($newsletter);
       $data['options'] = $this->buildOptions($newsletter);
       $data['total_sent'] = $statistics ? $statistics->getTotalSentCount() : 0;
-      $data['total_scheduled'] = SendingQueue::findTaskByNewsletterId($newsletter->getId())
-        ->where('tasks.status', SendingQueue::STATUS_SCHEDULED)
-        ->count();
     }
     return $data;
   }