[ios] Fix touch handling in groups
[ios] Fix touch handling in groups

Check all children before current node itself.
Add shortcut check to return active node if `event` is null. Otherwise
it may return wrong node which have higher z-index value.

react-native-community/react-native-svg,magicismight/react-native-art-svg,react-native-community/react-native-svg,msand/react-native-svg,magicismight/react-native-svg,react-native-community/react-native-svg,magicismight/react-native-art-svg,magicismight/react-native-svg,magicismight/react-native-svg,msand/react-native-svg,magicismight/react-native-svg,react-native-community/react-native-svg,msand/react-native-svg,magicismight/react-native-svg,react-native-community/react-native-svg,msand/react-native-svg