Fix e2e

AndroidE2E/app/src/androidTest/java/com/reactnativenavigation/e2e/androide2e/TopLevelApiTest.java

         assertExists(By.text("Hello from a function!"));
     }
 
-    @Ignore
     @Test
     public void switchToTabBasedApp_SwitchTab() throws Exception {
         elementByText("SWITCH TO TAB BASED APP").click();

playground/src/screens/WelcomeScreen.js

                     },
                     options: {
                       topBar: {
-                        visible: false
+                        visible: true,
+                        title: 'React Native Navigation!'
                       }
                     }
                   }