sub: fully update plaintext subtitle styles at runtime

Update options like --sub-text-margin-y at runtime. These are somewhat
of a problem, because ass_set_selective_style_override() (intentionally)
does not override them. This should be fixed in libass (by providing
additional override modes), but for now this will do.

Also change the signature of mp_ass_configure(), so we can get access to
the track.

Additionally, drop the redundant setting of the style Alignment (it's
overwritten by mp_ass_set_style()).

See #1622 (again).

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