config: use `yu` for copying URLs

It's my mistake; it should have been this way all along.

`u` is peek URL, so `yu` should copy the same URL. And of course `c`
displays a different URL than what is being copied. Ouch.

I would make `yc` copy the current page's URL too (instead of M-y...),
but that would make things way too confusing. Maybe sometime in the
future, when I unlearn `yc`.

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