minor refactor on answering call logic

Session/Calls/Call Management/SessionCallManager+CXProvider.swift

@@ -23,13 +23,14 @@ extension SessionCallManager: CXProviderDelegate {
             } else {
                 guard let presentingVC = CurrentAppContext().frontmostViewController() else { preconditionFailure() } // TODO: Handle more gracefully
                 let callVC = CallVC(for: self.currentCall!)
-                callVC.shouldAnswer = true
                 if let conversationVC = presentingVC as? ConversationVC {
                     callVC.conversationVC = conversationVC
                     conversationVC.inputAccessoryView?.isHidden = true
                     conversationVC.inputAccessoryView?.alpha = 0
                 }
-                presentingVC.present(callVC, animated: true, completion: nil)
+                presentingVC.present(callVC, animated: true) {
+                    call.answerSessionCall()
+                }
             }
             action.fulfill()
         } else {

Session/Calls/CallVC.swift

@@ -6,7 +6,6 @@ import UIKit
 
 final class CallVC : UIViewController, VideoPreviewDelegate {
     let call: SessionCall
-    var shouldAnswer = false
     var shouldRestartCamera = true
     weak var conversationVC: ConversationVC? = nil
     
@@ -218,7 +217,6 @@ final class CallVC : UIViewController, VideoPreviewDelegate {
                 }
             }
         }
-        if shouldAnswer { answerCall() }
     }
     
     func setUpViewHierarchy() {

Session/Calls/Views & Modals/IncomingCallBanner.swift

@@ -153,13 +153,14 @@ final class IncomingCallBanner: UIView, UIGestureRecognizerDelegate {
         dismiss()
         guard let presentingVC = CurrentAppContext().frontmostViewController() else { preconditionFailure() } // TODO: Handle more gracefully
         let callVC = CallVC(for: self.call)
-        callVC.shouldAnswer = answer
         if let conversationVC = presentingVC as? ConversationVC {
             callVC.conversationVC = conversationVC
             conversationVC.inputAccessoryView?.isHidden = true
             conversationVC.inputAccessoryView?.alpha = 0
         }
-        presentingVC.present(callVC, animated: true, completion: nil)
+        presentingVC.present(callVC, animated: true) {
+            if answer { self.call.answerSessionCall() }
+        }
     }
     
     public func show() {