LibWeb: Make HTMLPreElement's is_type match "listing" and "xmp"

I forgot to add these when I saw that listing and xmp are mapped to
HTMLPreElement.

Libraries/LibWeb/HTML/HTMLPreElement.h

@@ -41,5 +41,5 @@ public:
 }
 
 AK_BEGIN_TYPE_TRAITS(Web::HTML::HTMLPreElement)
-static bool is_type(const Web::DOM::Node& node) { return node.is_html_element() && downcast<Web::HTML::HTMLElement>(node).local_name() == Web::HTML::TagNames::pre; }
+static bool is_type(const Web::DOM::Node& node) { return node.is_html_element() && downcast<Web::HTML::HTMLElement>(node).local_name().is_one_of(Web::HTML::TagNames::pre, Web::HTML::TagNames::listing, Web::HTML::TagNames::xmp); }
 AK_END_TYPE_TRAITS()