fix: listener callback should bind this

[nieheyong]

when disconnect from wallet app,this lib will throw below error:

TypeError: this.resetAccount is not a function
    at EventEmitter.syncAccount (appKitClient.js:93:1)
    at EventEmitter.emit (events.js:158:1)
    at Zt.deleteSession (index.es.js:1:1)
    at async EventEmitter.<anonymous> (index.es.js:1:1)

It is because forget bind this for listener callback

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
walletconnect-solana	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 25, 2024 5:41pm

[glitch-txs]

Hello, how can I reproduce the issue?

[nieheyong]

Steps to reproduce

1. open playground web page, open chrome devtools console
2. slect wallet > More options > WalletConnect
3. select a wallet, for example MathWallet, scan and connect ,page show connect success
4. after connect success, click disconnect inside MathWallet app
5. chrome devtools console will show error

[nieheyong]

@glitch-txs Can you reproduce the issue according to my steps ?

[glitch-txs]

Thank you, I'll add a direct binding in other PR, I'm also adding you as contributor on release notes 👍

[glitch-txs]

closing in favor of #39