Fix dismissal in UIKit demos. (#2986)

* Fix dismissal in UIKit demos.

* Revert test code

Author: mbrandonw

Examples/CaseStudies/UIKitCaseStudies/LoadThenNavigate.swift

@@ -107,7 +107,7 @@ class LazyNavigationViewController: UIViewController {
   override func viewDidAppear(_ animated: Bool) {
     super.viewDidAppear(animated)
 
-    if !isMovingToParent {
+    if !isMovingToParent && store.optionalCounter != nil {
       store.send(.setNavigation(isActive: false))
     }
   }

Examples/CaseStudies/UIKitCaseStudies/NavigateAndLoad.swift

@@ -100,7 +100,7 @@ class EagerNavigationViewController: UIViewController {
   override func viewDidAppear(_ animated: Bool) {
     super.viewDidAppear(animated)
 
-    if !isMovingToParent {
+    if !isMovingToParent && store.isNavigationActive {
       store.send(.setNavigation(isActive: false))
     }
   }

Examples/TicTacToe/tic-tac-toe/Sources/LoginUIKit/LoginViewController.swift

@@ -126,7 +126,7 @@ public class LoginViewController: UIViewController {
   public override func viewDidAppear(_ animated: Bool) {
     super.viewDidAppear(animated)
 
-    if !isMovingToParent {
+    if !isMovingToParent && store.twoFactor != nil {
       store.twoFactorDismissed()
     }
   }