Fix pageSheet modals causing memory leak when swiped (#5601)

lib/ios/RNNModalManager.h

@@ -12,7 +12,7 @@ typedef void (^RNNTransitionRejectionBlock)(NSString *code, NSString *message, N
 
 @end
 
-@interface RNNModalManager : NSObject
+@interface RNNModalManager : NSObject <UIAdaptivePresentationControllerDelegate>
 
 @property (nonatomic, weak) id<RNNModalManagerDelegate> delegate;
 

lib/ios/RNNModalManager.m

@@ -29,6 +29,10 @@
 	UIViewController* topVC = [self topPresentedVC];
 	topVC.definesPresentationContext = YES;
 	
+	if (viewController.presentationController) {
+		viewController.presentationController.delegate = self;
+	}
+	
 	RNNAnimationsTransitionDelegate* tr = [[RNNAnimationsTransitionDelegate alloc] initWithScreenTransition:viewController.resolveOptions.animations.showModal isDismiss:NO];
 	if (hasCustomAnimation) {
 		viewController.transitioningDelegate = tr;
@@ -105,6 +109,10 @@
 	[_delegate dismissedModal:viewController];
 }
 
+- (void)presentationControllerDidDismiss:(UIPresentationController *)presentationController {
+	[_presentedModals removeObject:presentationController.presentedViewController];
+}
+
 -(UIViewController*)topPresentedVC {
 	UIViewController *root = UIApplication.sharedApplication.delegate.window.rootViewController;
 	while(root.presentedViewController) {