Fix Unexpected token ) in babel-preset-react-native
Fix Unexpected token ) in babel-preset-react-native

Summary:
Fixes #15513

cc jeanlauliac
Closes https://github.com/facebook/react-native/pull/15517

Differential Revision: D5644626

Pulled By: TheSavior

fbshipit-source-id: f90b35c29a1e7cd5a829ae44237deb050f9a29e2

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