xslf： pictureShape copy cannot deal with SVG copying

[zpc0921]

        // TODO: check for SVG copying
        CTOfficeArtExtensionList extLst = blip.getExtLst();
        for(CTOfficeArtExtension ext : extLst.getExtArray()){
            String xpath = "declare namespace a14='"+ MS_DML_NS +"' $this//a14:imgProps/a14:imgLayer";
            XmlObject[] obj = ext.selectPath(xpath);
            if(obj != null && obj.length == 1) {
                try (XmlCursor c = obj[0].newCursor()) {
                    String id = c.getAttributeText(EMBED_TAG);
                    String newId = getSheet().importBlip(id, p.getSheet());
                    c.setAttributeText(EMBED_TAG, newId);
                }
            }
        }