Fixes broken bottomTab text and icon on initialization - #4039

lib/ios/RNNRootViewController.m

 }
 
 - (void)willMoveToParentViewController:(UIViewController *)parent {
+	[_presenter presentOn:self];
 	if ([self.parentViewController respondsToSelector:@selector(performOnChildLoad:)]) {
 		[self.parentViewController performSelector:@selector(performOnChildLoad:) withObject:_presenter.options];
 	}

lib/ios/RNNTabBarPresenter.m

 	[self.options applyOnTabBarController:tabBarController];
 }
 
+- (void)present:(RNNNavigationOptions *)options on:(UITabBarController *)tabBarController {
+	[self.options applyOnTabBarController:tabBarController];
+}
+
 @end

playground/src/screens/WelcomeScreen.js

                   }
                 }
               }
+            },
+            {
+              component: {
+                name: 'navigation.playground.TextScreen',
+                passProps: {
+                  text: 'This is tab 3',
+                  myFunction: () => 'Hello from a function!'
+                },
+                options: {
+                  topBar: {
+                    visible: true
+                  },
+                  bottomTab: {
+                    text: 'Tab 3',
+                    icon: require('../images/one.png'),
+                    selectedIcon: require('../images/one.png')
+                  }
+                }
+              }
             }
           ],
           options: {