remove attribute instead of emptying it

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

@@ -797,7 +797,7 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 			}
 			await Promise.all(linkElements.map(async linkElement => {
 				const resourceURL = linkElement.href;
-				linkElement.setAttribute("href", EMPTY_DATA_URI);
+				linkElement.removeAttribute("href");
 				const options = Object.create(this.options);
 				options.insertSingleFileComment = false;
 				options.insertFaviconLink = false;