Summary:
Use correct path to testNotUTF8Convertible which is being skipped.
## Changelog
[Internal] - Use correct path to testNotUTF8Convertible which is being skipped.
Pull Request resolved: https://github.com/facebook/react-native/pull/27767
Test Plan: Circle CI
Differential Revision: D19404469
Pulled By: hramos
fbshipit-source-id: 70cf06c90dac74ac7963b9a35a543e11b21ba471