Ignore transform-origin and such shenanigans in SVGGeometryElement::LocalTransform.
We don't want the offsetted matrix, just the actual transform matrix
specified on the element.
Differential Revision: https://phabricator.services.mozilla.com/D224217
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1921662
gecko-commit: dd364824053b80e505688cfb4bf8a2f17b70019a
gecko-reviewers: longsonr