fix CallKit failed to report new incoming calls in focus mode

Session/Calls/Call Management/SessionCallManager.swift

@@ -92,7 +92,7 @@ public final class SessionCallManager: NSObject {
         // Report the incoming call to the system
         self.provider.reportNewIncomingCall(with: call.callID, update: update) { error in
             guard error == nil else {
-                self.currentCall = nil
+                self.reportCurrentCallEnded(reason: .failed)
                 completion(error)
                 Logger.error("failed to report new incoming call, error: \(error!)")
                 return

Session/Meta/AppDelegate.swift

@@ -28,6 +28,10 @@ extension AppDelegate {
     
     private func showCallUIForCall(_ call: SessionCall) {
         DispatchQueue.main.async {
+            call.reportIncomingCallIfNeeded{ error in
+                if let error = error {
+                    SNLog("[Calls] Failed to report incoming call to CallKit due to error: \(error)")
+                } else {
                     if CurrentAppContext().isMainAppAndActive {
                         guard let presentingVC = CurrentAppContext().frontmostViewController() else { preconditionFailure() } // TODO: Handle more gracefully
                         if let conversationVC = presentingVC as? ConversationVC, let contactThread = conversationVC.thread as? TSContactThread, contactThread.contactSessionID() == call.sessionID {
@@ -38,11 +42,6 @@ extension AppDelegate {
                             presentingVC.present(callVC, animated: true, completion: nil)
                         }
                     }
-            call.reportIncomingCallIfNeeded{ error in
-                if let error = error {
-                    SNLog("[Calls] Failed to report incoming call to CallKit due to error: \(error)")
-                    let incomingCallBanner = IncomingCallBanner(for: call)
-                    incomingCallBanner.show()
                 }
             }
         }