title: headerLeft is not working in reactNavigation V3
body: <p>I have checked previous answers and tried different methods but still not working. Only if I use static navigationOptions inside the screen it works</p>
  
  <p>I tried using defaultNavigationOptions but not working also navigationOptions on its on is not working</p>
  
  <pre><code>TIMETABLE = createStackNavigator(
      {
          timetable: {
              screen: timetable,
              defaultNavigationOptions: {
                  title: i18n.t('TIMETABLE'),
                  headerStyle,
                  headerTitleStyle,
                  headerLeft: (
                      &lt;Button
                          title="oi"
                          color="#fff"
                      /&gt;
                  )
              }
          }
      }
  );
  
  the above does not work and neither the below code: 
  
  TIMETABLE = createStackNavigator(
      {
          timetable: {
              screen: timetable,
              navigationOptions: {
                  title: i18n.t('TIMETABLE'),
                  headerStyle,
                  headerTitleStyle,
                  headerLeft: (
                      &lt;Button
                          title="oi"
                          color="#fff"
                      /&gt;
                  )
              }
          }
      }
  );
  </code></pre>
  
  <p>Expecting to see a button with the title 'oi' on the left of the stack navigator header, but no button appears.</p>