Removed "unsubscribed" events from member activity feed

refs 63f7f9a827
closes https://github.com/TryGhost/Team/issues/446

- email failures no longer auto-unsubscribe members so we shouldn't show that in the activity feed

ghost/admin/app/components/gh-member-activity-feed.js

@@ -18,11 +18,6 @@ class MemberActivity {
             icon: 'cross-circle',
             iconClass: 'red-d2',
             tooltip: 'Email delivery failed'
-        },
-        unsubscribed: {
-            icon: 'unsubscribed',
-            iconClass: 'red-d2',
-            message: 'Automatically unsubscribed due to permanent delivery failure'
         }
     }
 
@@ -73,11 +68,6 @@ export default class MemberActivityFeedComponent extends Component {
                     timestamp: emailRecipient.failedAtUTC,
                     action: this.openEmailPreview.bind(this, emailRecipient.email)
                 }));
-
-                activities.push(new MemberActivity({
-                    event: 'unsubscribed',
-                    timestamp: emailRecipient.failedAtUTC.add(1, 'second')
-                }));
             } else if (emailRecipient.processedAtUTC) {
                 activities.push(new MemberActivity({
                     event: 'sent',