removed unneeded spaces

lib/single-file/fonts-minifier.js

@@ -189,7 +189,7 @@ this.fontsMinifier = this.fontsMinifier || (() => {
 				cssStyles.push(propertyName + ":" + rule.style.getPropertyValue(propertyName));
 			}
 		});
-		return "@font-face {" + cssStyles.join(";") + "}";
+		return "@font-face{" + cssStyles.join(";") + "}";
 	}
 
 	function deleteUnusedFonts(doc, rules, unusedFonts) {
@@ -198,7 +198,7 @@ this.fontsMinifier = this.fontsMinifier || (() => {
 			Array.from(rules).forEach(rule => {
 				const fontFamilyName = rule.style && rule.style.getPropertyValue("font-family");
 				if (rule.media) {
-					stylesheetContent += "@media " + Array.prototype.join.call(rule.media, ",") + " {";
+					stylesheetContent += "@media " + Array.prototype.join.call(rule.media, ",") + "{";
 					stylesheetContent += deleteUnusedFonts(doc, rule.cssRules, unusedFonts);
 					stylesheetContent += "}";
 				} else if (rule.type != CSSRule.FONT_FACE_RULE || (rule.type == CSSRule.FONT_FACE_RULE && rule.style && fontFamilyName && !unusedFonts.includes(getFontFamilyName(fontFamilyName)))) {