Change to style CDATA not detected

Changes to the CDATA of a style element are not reflected in a document loaded in a JSVGComponent.

To reproduce: Load the attached document cdata.svg and click on the square. This will run a script to replace the CDATA content of a style element.

Observed: No change.

Expected: The square should alternate between red and blue when clicked.

Workaround: Replace the entire style element instead of its contents.

Analysis: I think this is a simple copy-and-paste-o in SVGOMDocument.DOMCharacterDataModifiedListenerWrapper, which forwards its event using the subTreeModified(Node) method instead of characterDataModified(Node), which is what I would have expected.