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Summary: ## Changelog make RNTesterApp take a `customBackButton` prop to enable overriding whether to display back button and the look by default, only ios platform has a back button, and android app relies on back button on navigation bar that comes with platform [Internal] Reviewed By: christophpurrer Differential Revision: D58218208 fbshipit-source-id: 63a47390cc6d3de057b92a3c522c1b00d942c69d