Remove chonky header for single modules (#50672)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/50672

We have precious little screen real estate, esp in E2E tests where we get 320x192 dips. Let's clean this up.

Changelog: [Internal]

Reviewed By: cortinico, GijsWeterings

Differential Revision: D72683491

fbshipit-source-id: 222a77f937dfb9dcceb627d8f084c58df7c07b56