Fix horizontal scrollview scrollTo coordinate space in RTL on oldarch (#42094)

Summary:
Pull Request resolved: #42094

Fabric fixed this a while back with 9ca460f

Looks like this is still broken on Paper, and now VirtualizedList relies on it. #38737 (comment)

Changelog:
[ios][fixed] - Fix horizontal scrollview scrollTo coordinate space in RTL on oldarch

Reviewed By: lenaic

Differential Revision: D52451602

fbshipit-source-id: f41d8248c7f6ab23965800b09ca1082fd1a15151

Author: NickGerleman

packages/react-native/React/Views/ScrollView/RCTScrollView.m

@@ -568,6 +568,10 @@ - (void)scrollToOffset:(CGPoint)offset
 
 - (void)scrollToOffset:(CGPoint)offset animated:(BOOL)animated
 {
+  if ([self reactLayoutDirection] == UIUserInterfaceLayoutDirectionRightToLeft) {
+    offset.x = _scrollView.contentSize.width - _scrollView.frame.size.width - offset.x;
+  }
+
   if (!CGPointEqualToPoint(_scrollView.contentOffset, offset)) {
     CGRect maxRect = CGRectMake(
         fmin(-_scrollView.contentInset.left, 0),