LibPDF: Fix lookup of built-in Bold Italic strings

Liberation*-BoldItalic.ttf apparently self-identifies as "Bold Italic",
not "BoldItalic".

Userland/Libraries/LibPDF/Fonts/PDFFont.cpp

@@ -73,7 +73,7 @@ PDFErrorOr<NonnullRefPtr<Gfx::Font>> PDFFont::replacement_for(StringView name, f
     FlyString font_variant;
 
     if (is_bold && is_italic) {
-        font_variant = "BoldItalic"_fly_string;
+        font_variant = "Bold Italic"_fly_string;
     } else if (is_bold) {
         font_variant = "Bold"_fly_string;
     } else if (is_italic) {