Fix popGesture freezes the app - #4388

lib/ios/RNNNavigationStackManager.m

@@ -12,7 +12,6 @@ typedef void (^RNNAnimationBlock)(void);
 		nvc.delegate = animationDelegate;
 	} else {
 		nvc.delegate = nil;
-		nvc.interactivePopGestureRecognizer.delegate = nil;
 	}
 	
 	[self performAnimationBlock:^{