Don't notify for closed group control messages

This addresses an issue where:

• someone would create a closed group
• on other peoples' devices this control message would be received through a background poll or a push notification
• the received message timestamps table would be updated
• processing wouldn't be finished (during a background poll or while handling a push notification the system can cut you off at any time)
• some of the added users don't see the new closed group because when they open the app and get the control message from their swarm it's considered a duplicate and isn't processed again

SessionMessagingKit/Sending & Receiving/MessageSender.swift

@@ -212,9 +212,11 @@ public final class MessageSender : NSObject {
                     storage.write(with: { transaction in
                         MessageSender.handleSuccessfulMessageSend(message, to: destination, isSyncMessage: isSyncMessage, using: transaction)
                         var shouldNotify = (message is VisibleMessage && !isSyncMessage)
+                        /*
                         if let closedGroupControlMessage = message as? ClosedGroupControlMessage, case .new = closedGroupControlMessage.kind {
                             shouldNotify = true
                         }
+                         */
                         if shouldNotify {
                             let notifyPNServerJob = NotifyPNServerJob(message: snodeMessage)
                             if isMainAppAndActive {