fix an issue that the camera freezes after scanning something other than a session id in new conversation screen

Session/Home/New Conversation/NewMessageScreen.swift

@@ -53,6 +53,10 @@ struct NewMessageScreen: View {
     fileprivate func startNewPrivateChatIfPossible(with sessionId: String, onError: (() -> ())?) {
         if !KeyPair.isValidHexEncodedPublicKey(candidate: sessionId) {
             errorString = "qrNotAccountId".localized()
+            
+            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
+                onError?()
+            }
         }
         else {
             startNewDM(with: sessionId)
@@ -64,16 +68,12 @@ struct NewMessageScreen: View {
     }
     
     func continueWithAccountIdOrONS() {
-        startNewDMIfPossible(with: accountIdOrONS, onError: nil)
-    }
-    
-    fileprivate func startNewDMIfPossible(with onsNameOrPublicKey: String, onError: (() -> ())?) {
-        let maybeSessionId: SessionId? = SessionId(from: onsNameOrPublicKey)
+        let maybeSessionId: SessionId? = SessionId(from: accountIdOrONS)
         
-        if KeyPair.isValidHexEncodedPublicKey(candidate: onsNameOrPublicKey) {
+        if KeyPair.isValidHexEncodedPublicKey(candidate: accountIdOrONS) {
             switch maybeSessionId?.prefix {
                 case .standard:
-                    startNewDM(with: onsNameOrPublicKey)
+                    startNewDM(with: accountIdOrONS)
                     
                 default:
                     errorString = "accountIdErrorInvalid".localized()
@@ -85,7 +85,7 @@ struct NewMessageScreen: View {
         ModalActivityIndicatorViewController
             .present(fromViewController: self.host.controller?.navigationController!, canCancel: false) { modalActivityIndicator in
             SnodeAPI
-                .getSessionID(for: onsNameOrPublicKey)
+                .getSessionID(for: accountIdOrONS)
                 .subscribe(on: DispatchQueue.global(qos: .userInitiated))
                 .receive(on: DispatchQueue.main)
                 .sinkUntilComplete(