Fix <use> to use local resource instead of absolute path

[lele0108]

Previously when <svg>s were snapshotted, <use> tag href was serialized to absolute path. But one's that start with '#' should be a local resource and should not be serialized to absolute path and instead left as is.

Previously:
<use href="https://google.com/#resource-a"></use>

Which would not resolve the correct local resource.

Now:
<use href="#resource-a"></use>

Which correctly resolves the local svg resource. It looks like the xlink:href case is already handled (but that attribute is deprecated in new svg spec)

See: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/use

[Yuyz0112]

Thanks!