Normalize scheme for URL on Android (#21561)

Summary:
Android requires lowercase for URL scheme. This commit https://github.com/facebook/react-native/commit/d00bdb9bb8b9b11bce900689c7e28cebd2eb0807 fixed it but on React Native side.
Because it is Android specific, it should be fixed on Android side.

Android has method to normalize url scheme: https://developer.android.com/reference/android/net/Uri.html#normalizeScheme()
Pull Request resolved: https://github.com/facebook/react-native/pull/21561

Differential Revision: D10287868

Pulled By: hramos

fbshipit-source-id: f5e474164fdb2cfd49bd8ee51da17de3f1341a9c