With trailingSlash set to 'never', root path still gets trailing slash

[paulrudy]

This issue is similar to #76, but only happens with the root path.

In Astro.config, with

export default defineConfig({
  site: 'https://example.com',
  trailingSlash: 'never',
})

astro-seo produces <link rel="canonical" href="http://example.com/"> with a trailing slash.

For pages, the trailing slash is removed as expected (<link rel="canonical" href="http://example.com/page">)