command: update sub-fps etc. options on runtime changes

Un-special-case the sub-speed property, and apply subtitle speed updates
in more cases. In particular, this respects runtime changes of the
sub-fps option.

(A minor consequence of this is that the subtitle speed is recomputed
more often even in cases when it's not necessary. Also, the subtitle
update is slightly "delayed" rather than strictly instant. Both of
these likely are absolutely not observable by the user, although the
subtitle speed verbose log message will be printed more often if the
subtitle format is MicroDVD.)

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