lua: change runtime option change behavior

As described in the manpage changes. This makes more sense than the
previous approach, where options could "unexpectedly" stick. Although
this is still a somewhat arbitrary policy (ask many people and you'd get
a number of different expectations on what should happen), I think that
it reflects what mpv's builtin stuff does.

All the copying is annoying, but let's just hope nobody is stupid enough
to change these properties per video frame or something equally
ridiculous.

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