[landing] Update useMonitorForWalletConnectModal for new WalletConnect modal

Summary:
The WalletConnect modal has been updated, and now the HTML is slightly different.

Depends on D9434

Test Plan:
I tested the WalletConnect modal:

1. Tested iOS and Android physical devices
2. Tested in a public staging environment (comm.domains)
3. Tested the QR code scan feature on web
4. Tested expanding to see "All wallets"
5. Tested selecting a wallet (Rainbow)
6. Tested searching for a wallet by typing a query

Some videos of the testing can be seen in the final diff in the stack.

Reviewers: rohan, atul, ginsu

Reviewed By: atul

Subscribers: tomek, wyilio

Differential Revision: https://phab.comm.dev/D9435