fixed attribute removal

lib/single-file/html-images-minifier.js

@@ -53,8 +53,8 @@ this.imagesMinifier = this.imagesMinifier || (() => {
 						const refImageElement = doc.getElementById(refImageId);
 						if (refImageElement && refImageElement.getAttribute("xlink:href").startsWith(PREFIX_DATA_URI_IMAGE_SVG)) {
 							svgElement.removeAttributeNS(SVG_NS, "preserveAspectRatio");
-							svgElement.removeAttributeNS(SVG_NS, TRANSFORMED_IMAGE_ATTRIBUTE);
 						}
+						svgElement.removeAttribute(TRANSFORMED_IMAGE_ATTRIBUTE);
 					}
 				}
 			});