remove surrounding quotes from unicode ranges (fix #368)

lib/single-file/modules/css-fonts-minifier.js

@@ -300,6 +300,7 @@ this.singlefile.lib.modules.fontsMinifier = this.singlefile.lib.modules.fontsMin
 	}
 
 	function testUnicodeRange(docContent, unicodeRange) {
+		unicodeRange = singlefile.lib.helper.removeQuotes(unicodeRange);
 		if (unicodeRange) {
 			const unicodeRanges = unicodeRange.split(REGEXP_COMMA);
 			let invalid;