[META] Update near-wallet.js to latest version on all examples

[gagdiez]

All our examples use the same near-wallet file that abstracts away the complexity of using the near-wallet-selector. We need to make sure all canonical examples have the methods used here:

https://github.com/near/near-discovery/blob/9b6332176e7fb6e1495a9f077ef4d4fdc42573e8/src/components/WalletSelector.ts

Notice that in the examples we use Javascript and JSDocs

• [x] Hello World: https://github.com/near-examples/hello-near-examples
• [ ] Guest Book: https://github.com/near-examples/guest-book-examples
• [ ] Counters: https://github.com/near-examples/counters
• [ ] Coin Flip: https://github.com/near-examples/coin-flip-examples
• [ ] Donations: https://github.com/near-examples/donation-examples
• [ ] Multiple Contracts: https://github.com/near-examples/frontend-multiple-contracts
• etc