player: do not destroy VO immediately if there is no video track

Commit f1d161d55f accidentally added the handle_force_window() call if
no track is selected.

This was OK, but breaks something like "mpv *", where some files are not
playable (like subtitle files) - the unplayable files would remove and
recreate the VO window, which is annoying.

Just drop the call again.

player/video.c

@@ -461,7 +461,6 @@ void reinit_video_chain(struct MPContext *mpctx)
     struct track *track = mpctx->current_track[0][STREAM_VIDEO];
     if (!track || !track->stream) {
         error_on_track(mpctx, track);
-        handle_force_window(mpctx, true);
         return;
     }
     reinit_video_chain_src(mpctx, track);