Fix: find-node.sh location in react-native-xcode.sh script (#32227)

Summary:
Fix the `find-node.sh` call in `react-native-xcode.sh` script

## Related issue
#32168

## Changelog

[iOS] [Fixed] - Fix for unable to find `find-node.sh` in `react-native-xcode.sh` script

Pull Request resolved: #32227

Test Plan: • Run an Xcode build which uses the `scripts/react-native-xcode.sh` in the JS Bundle build phase.

Reviewed By: TheSavior

Differential Revision: D31022043

Pulled By: GijsWeterings

fbshipit-source-id: 10aafd595c3a3a87c22f385ca4f61756f67e9b9d

scripts/react-native-xcode.sh

@@ -81,7 +81,7 @@ fi
 
 # Find path to Node
 # shellcheck source=/dev/null
-source "$RN_DIR/scripts/find-node.sh"
+source "$REACT_NATIVE_DIR/scripts/find-node.sh"
 
 # check and assign NODE_BINARY env
 # shellcheck source=/dev/null