Fix crash when displaying poll finished notification

Tusker/Views/Notifications/PollFinishedTableViewCell.swift

@@ -55,6 +55,8 @@ class PollFinishedTableViewCell: UITableViewCell {
         let doc = try! SwiftSoup.parseBodyFragment(status.content)
         statusContentLabel.text = try! doc.text()
         
+        pollView.mastodonController = mastodonController
+        pollView.toastableViewController = delegate
         pollView.updateUI(status: status, poll: poll)
     }