LibWeb: Add a few missing visits to m_rel_list members

Author: https://github.com/mattco98
Commit: 74aeb57631
Pull-request: https://github.com/SerenityOS/serenity/pull/24350
Reviewed-by: https://github.com/ADKaster ✅

Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp

@@ -564,6 +564,7 @@ void HTMLLinkElement::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
     visitor.visit(m_loaded_style_sheet);
+    visitor.visit(m_rel_list);
 }
 
 }