[landing] updated which wagmi parameter is the actual address

Summary: wagmi's latest useAccount() has a more sane api surface for exposing the address

Test Plan: run landing, console.log the address and find that it exists

Reviewers: atul, varun, abosh, ashoat

Reviewed By: ashoat

Subscribers: tomek, varun, abosh, atul, ashoat

Differential Revision: https://phab.comm.dev/D5161