Bug: pauseAllPlayers() resets completed audios #490

If I have multiple players on a page, like
Player 1
Player 2
Player 3

1. I finished playing Player 1, the whole waveform will be colored to show it is completed
2. Now I play Player 2, by calling

await _playerController.pauseAllPlayers(); // To avoid multiple players playing at the same time
await _playerController.startPlayer();

3. Player 1 will now be un-colored, which is an unintended side effect of pauseAllPlayers()