command: react to --force-window changes with no file playing #16958
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handle_force_window() is called in play_current_file() and run_playloop(), so it is never triggered if you do mpv --idle and then change force-window at runtime. Move the playloop call to the option callbacks to fix this.
Fixes #16956.
Giving the UPDATE_VO flag to --force-window would not fix this due to it having no effect if there's isn't already a window, which prevents the bug described in 544240c. It would also reinit the VO unnecessarily when cycling between force-window yes and immediate.