Remove unnecessary messages added in #1879.
It is duplicated with other keys, causing the correct message not to be displayed.
toggle_sound: { id: 'video_player.toggle_sound', defaultMessage: 'Toggle sound' },
toggle_visible: { id: 'video_player.toggle_visible', defaultMessage: 'Toggle visibility' },
expand_video: { id: 'video_player.expand', defaultMessage: 'Expand video' },
- expand_video: { id: 'video_player.video_error', defaultMessage: 'Video could not be played' }
});
class VideoPlayer extends React.PureComponent {