Reset player before each test

[wvanhaevre]

---

assumption:

1. reRender() — schedules setState, React hasn't flushed yet
2. getTestPlayer() — waits 200ms, checks testPlayer → it's still the old player from the previous test → resolves immediately
3. Test proceeds — creates connector on old player, registers event listeners for SOURCE_CHANGE/PLAY/PLAYING, sets player.source
4. React finally reconciles — unmounts old TestableTHEOplayerView → native player is destroyed underneath
5. Events never fire on the now-dead player → 30s timeout → test fails

[changeset-bot]

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