Stop ProgressBarDesktop when an unknown error occurs

[ibeckermayer]

This listener was removed from ProgressBarDesktop, since in the typical case of a playback, the websocket is closed by the server before the progress bar has reached its final destination, so we don't want to stopProgress. The original impetus for adding it was to make the progress bar stop if the websocket closed unexpectedly (when we get a connection to the server failed for an unknown reason).

Refactor the ProgressBarDesktop so that it can be stopped if this websocket closure was due to an unexpected error rather than a normal operation. This logic is handled in useDesktopPlayer, and will probably involve abstracting out a useProgressBarDesktop that can be invoked from within there and passed into the ProgressBarDesktop, so that ProgressBarDesktop's behavior can be modified from useDesktopPlayer.