wget2 | Wrong processing `data:` URI in css (#629)

[dofu (@dofu)]

dofu created an issue: https://gitlab.com/gnuwget/wget2/-/issues/629



When mirroring, wget2 tries to download `data:` URI in css.

Error message:
```
Cannot resolve URI 
'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2Fy...'
Adding URL: 
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2Fy...
```

index.html:
```html
<style type="text/css">
i.icon-_blank {
  background-image: 
url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2Fy...");
}
</style>
```

`data:` URI should be skipped.

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