LibWeb: Set default fantasy font to Comic Book

> Fantasy fonts are primarily decorative or expressive fonts that
> contain decorative or expressive representations of characters.
https://drafts.csswg.org/css-fonts/#valdef-font-family-fantasy

Seems like this font fits this description. :)

Author: krkk

Userland/Libraries/LibWeb/CSS/StyleComputer.cpp

@@ -861,9 +861,10 @@ void StyleComputer::compute_font(StyleProperties& style, DOM::Element const* ele
             return find_font("Csilla");
         case ValueID::Serif:
             return find_font("Roman");
+        case ValueID::Fantasy:
+            return find_font("Comic Book");
         case ValueID::SansSerif:
         case ValueID::Cursive:
-        case ValueID::Fantasy:
         case ValueID::UiSerif:
         case ValueID::UiSansSerif:
         case ValueID::UiRounded: