Webhook update hotfix

[howard-at-cb]

What changed? Why?

Fixed a bug that overwrites existing webhook notification URI when only updating a webhook's addresses

 let wh = await Webhook.create({ networkId: "base-mainnet", notificationUri: "https://www.google.com/callback", eventType: "wallet_activity",  eventTypeFilter: {addresses: ["0xa55C5950F7A3C42Fa5799B2Cac0e455774a07382"], wallet_id: "w1"}, eventFilters: [{ contract_address: "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913" }], signatureHeader: "optional-signature-string"});
undefined
> wh.update({eventTypeFilter: {addresses:["0x40A28c0fCc0BE09400bB89CdF556Cd8C4eF1c165","0x6f03b3Df22F0C57A4477EEAc3a49c2Bc4EAe2206"]}})
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 136,
  [Symbol(trigger_async_id_symbol)]: 4
}
> wh
Webhook {
  model: {
    created_at: '2024-10-09T18:47:59.182Z',
    event_filters: [ [Object] ],
    event_type: 'wallet_activity',
    event_type_filter: { addresses: [Array], wallet_id: 'w1' },
    id: '6706cfdf1f3dda7f7fc8f6d2',
    network_id: 'base-mainnet',
    notification_uri: 'https://www.google.com/callback',
    updated_at: '2024-10-09T18:48:13.901Z'
  }
}

 wh.update({notificationUri: "https://abc.com/callback"})
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 563,
  [Symbol(trigger_async_id_symbol)]: 4
}
> wh.toString()
`Webhook { id: '670706861f3dda7f7fc8f6d9', networkId: 'base-mainnet', eventType: 'wallet_activity', eventFilter: [{"contract_address":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913"}], eventTypeFilter: {"addresses":["0x40a28c0fcc0be09400bb89cdf556cd8c4ef1c165","0x6f03b3df22f0c57a4477eeac3a49c2bc4eae2206"],"wallet_id":"w1"}, notificationUri: 'https://abc.com/callback', signatureHeader: 'undefined' }`

ref PR #288

Qualified Impact