Detach button react view on reload (#3805)

lib/ios/RNNNavigationButtons.m

 @interface RNNNavigationButtons()
 
 @property (weak, nonatomic) RNNRootViewController* viewController;
-@property (strong, nonatomic) NSArray* rightButtons;
-@property (strong, nonatomic) NSArray* leftButtons;
 @property (strong, nonatomic) RNNButtonOptions* defaultLeftButtonStyle;
 @property (strong, nonatomic) RNNButtonOptions* defaultRightButtonStyle;
 
 	}
 	
 	if ([side isEqualToString:@"left"]) {
-		self.leftButtons = barButtonItems;
-		[self.viewController.navigationItem setLeftBarButtonItems:self.leftButtons animated:animated];
+		[self.viewController.navigationItem setLeftBarButtonItems:barButtonItems animated:animated];
 	}
 	
 	if ([side isEqualToString:@"right"]) {
-		self.rightButtons = barButtonItems;
-		[self.viewController.navigationItem setRightBarButtonItems:self.rightButtons animated:animated];
+		[self.viewController.navigationItem setRightBarButtonItems:barButtonItems animated:animated];
 	}
 }
 

lib/ios/RNNRootViewController.m

 	[[NSNotificationCenter defaultCenter] removeObserver:self.view];
 	self.view = nil;
 	self.navigationItem.titleView = nil;
+	self.navigationItem.rightBarButtonItems = nil;
+	self.navigationItem.leftBarButtonItems = nil;
 	_customTopBar = nil;
 	_customTitleView = nil;
 	_customTopBarBackground = nil;