docs(guides/adding-delegation): change to account for API changes 🏎

[qbzzt]

Specifically, change App.tsx to account for the fact getContract now wants a structure with the two clients.

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[holic]

we're not returning this anymore, so I don't think we need this comment?
and that said, should we just return the getContract result rather than { world: getContract(...) }?

nevermind, I see references in code below that still use client so maybe we should restore the returned client as client: walletClient?