ignore font-variant when trying to match used fonts with loaded ones

lib/single-file/util/doc-helper.js

@@ -127,7 +127,7 @@ this.docHelper = this.docHelper || (() => {
 			const fontFamilyNames = style.fontFamily.split(",");
 			fontFamilyNames.forEach(fontFamilyName => {
 				fontFamilyName = normalizeFontFamily(fontFamilyName);
-				if (!loadedFonts || loadedFonts.find(font => normalizeFontFamily(font.family) == fontFamilyName && font.style == style.fontStyle && font.variant == style.fontVariant)) {
+				if (!loadedFonts || loadedFonts.find(font => normalizeFontFamily(font.family) == fontFamilyName && font.style == style.fontStyle)) {
 					const { fontWeight, fontStyle, fontVariant } = style;
 					usedFonts.add([fontFamilyName, fontWeight, fontStyle, fontVariant]);
 				}