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. :)

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: