SVGs do not use custom fonts included with `useFont(FSSupplier<InputStream> supplier, ...)`

The issue seems to be the `font.fontFile != null` check at [in PdfRendererBuilder](https://github.com/danfickle/openhtmltopdf/blob/780ba564839f1ad5abfa5df12e4aebb9dd6782d2/openhtmltopdf-pdfbox/src/main/java/com/openhtmltopdf/pdfboxout/PdfRendererBuilder.java#L79):
```
if (state._svgImpl != null &&
font.fontFile != null &&
font.usedFor.contains(FSFontUseCase.SVG)) {
try {
state._svgImpl.addFontFile(font.fontFile, font.family, font.weight, font.style);
} catch (IOException | FontFormatException e) {
XRLog.log(Level.WARNING, LogMessageId.LogMessageId1Param.INIT_FONT_COULD_NOT_BE_LOADED, font.fontFile.getPath(), e);
}
}
```

I'd like for fonts to be usable in SVGs even if they are supplied via input stream (rather than by file).