fixed URL resolving issue with inlined stylesheets

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

@@ -737,6 +737,7 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 		}
 
 		static async processStylesheet(stylesheetContent, baseURI) {
+			stylesheetContent = DomProcessorHelper.resolveStylesheetURLs(stylesheetContent, baseURI);
 			const urlFunctions = DomUtil.getUrlFunctions(stylesheetContent);
 			await Promise.all(urlFunctions.map(async urlFunction => {
 				let resourceURL = DomUtil.matchURL(urlFunction);