Ensure Firestore example widgets are initialized #1859
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Firestore example risks widgets not being initialized resulting in an exception eg:
E/flutter (32544): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.. This PR addsWidgetsFlutterBinding.ensureInitialized()to ensure that this exception is avoided.