always remove singleFileOriginURL

lib/single-file/single-file-core.js

@@ -1751,6 +1751,8 @@ this.singlefile.lib.core = this.singlefile.lib.core || (() => {
 				let resourceURL = resourceElement.getAttribute(attributeName);
 				if (resourceURL != null) {
 					resourceURL = normalizeURL(resourceURL);
+					let originURL = resourceElement.dataset.singleFileOriginURL;
+					delete resourceElement.dataset.singleFileOriginURL;
 					if (!testIgnoredPath(resourceURL)) {
 						resourceElement.setAttribute(attributeName, EMPTY_IMAGE);
 						if (testValidPath(resourceURL)) {
@@ -1761,9 +1763,7 @@ this.singlefile.lib.core = this.singlefile.lib.core || (() => {
 							}
 							if (testValidURL(resourceURL)) {
 								let { content, indexResource, duplicate } = await batchRequest.addURL(resourceURL, true, resourceElement.tagName == "IMG" && attributeName == "src");
-								if (resourceElement.dataset.singleFileOriginURL) {
-									let originURL = resourceElement.dataset.singleFileOriginURL;
-									delete resourceElement.dataset.singleFileOriginURL;
+								if (originURL) {
 									if (content == EMPTY_DATA_URI) {
 										try {
 											originURL = util.resolveURL(originURL, baseURI);