Fix CSS font URL with fragment identifier not be replaced by revved file...

Fix CSS font URL with fragment identifier not be replaced by revved file path. 

#264 only fixed URL suffixed by a question mark AND a fragment identifier, like this:
```url("/styles/fonts/icons.svg?#icons") format("svg”);```

This patch fixes a more common SVG font URLs, like this:
```url("/styles/fonts/icons.svg#icons") format("svg”);```

Will be correctly replaced by the revved version:
```url("/styles/fonts/icons.32941d63.svg#icons") format("svg”);```