fix: baseURL defaults when configured as object

[cossssmin]

This PR fixes an issue with baseURL defaults when it is configured as an object.

Specifically, in this case the url was not being appended to <style> tags or inline CSS, you had to enable them manually, i.e.:

baseURL: {
  url: 'https://example.com/images/',
  tags: ['img', 'source'],
  inlineCss: true,
  styleTag: true,
},

Now you can just do this and it will work:

baseURL: {
  url: 'https://example.com/images/',
  tags: ['img', 'source']
},