Attribute defaultChecked should be outputted as checked instead of defaultChecked

[alvinleung1996]

Describe the bug
The defaultChecked boolean attribute is not properly outputted in the html.

To Reproduce

Run the following code in a Node REPL:

const { createElement } = await import('preact')
const { renderToString } = await import('preact-render-to-string')

const html = renderToString(
  createElement('input', {
    type: 'checkbox',
    defaultChecked: true,
  }),
)

console.log(html)
// <input type="checkbox" defaultChecked />

Expected behavior

The output should be <input type="checkbox" checked />