title: When I end call from callKit call doen't ends I am able to see green StatusBar
body: <p>I am developing one app using callKit and Agora video calling library 
  In that app when I end the call from callKit and go in background I am able to see green StatusBar </p>
  
  <p>Here is my code for end call : </p>
  
  <pre><code> let endCallAction = CXEndCallAction(call: call.uuid)
      let transaction = CXTransaction(action: endCallAction)
      callController.request(transaction) { error in
          if let error = error {
              print("EndCallAction transaction request failed: \(error.localizedDescription).")
              return
          }
  
          print("EndCallAction transaction request successful")
  
      }
  </code></pre>