try to fix a call issue when iOS is on lock screen

Session/Notifications/PushRegistrationManager.swift

@@ -250,9 +250,8 @@ public enum PushRegistrationError: Error {
                 call.callMessageID = infoMessage.uniqueId
             }
             let appDelegate = UIApplication.shared.delegate as! AppDelegate
+            // NOTE: Just start 1-1 poller so that it won't wait for polling group messages
             appDelegate.startPollerIfNeeded()
-            appDelegate.startClosedGroupPoller()
-            appDelegate.startOpenGroupPollersIfNeeded()
             call.reportIncomingCallIfNeeded { error in
                 if let error = error {
                     SNLog("[Calls] Failed to report incoming call to CallKit due to error: \(error)")

SessionMessagingKit/Sending & Receiving/MessageReceiver.swift

@@ -174,6 +174,8 @@ public enum MessageReceiver {
                 // • This method was invoked and the received message timestamps table was updated
                 // • Processing wasn't finished
                 // • The user doesn't see the new closed group
+            } else if let message = message as? CallMessage, case .offer = message.kind{
+                // Allow duplicates for all call offer messages
             } else {
                 guard !Set(storage.getReceivedMessageTimestamps(using: transaction)).contains(envelope.timestamp) || isRetry else { throw Error.duplicateMessage }
                 storage.addReceivedMessageTimestamp(envelope.timestamp, using: transaction)