RN: Follow-up Format w/ Prettier v2.x

Summary:
When I upgraded React Native to Prettier v2.x, I removed `format` from a few files to reduce the number of changes.

This is a follow-up to bring back `format` and fix any remaining issues.

Changelog:
[Internal]

Reviewed By: zertosh

Differential Revision: D32287259

fbshipit-source-id: 37ea6d2c973b1db5d37c46d73675bdf436fb9a9d