fix: include ref's transform in `Use().get_path()`

t0b3requested to merge
t0b3/extensions:fix-use-get-path into master

What does the merge request do?

Use().get_path() is expected to include the original transform according to it's description. This MR brings the expected behavior.

Implementation notes

include ref's transform in Use().get_path()

Summary for release notes

fix get_path() on Use elements to include the referenced transform.

Checklist

  • Add unit tests (if applicable)
  • Changes to inkex/ are well documented
  • Clean merge request history

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