LibWeb: Allow using queuing strategies on globals other than Window

These interfaces are exposed on *, meaning it should work for workers
and our newly added shadow realm global object by being stored on the
universal global scope mixin.

Libraries/LibWeb/HTML/WorkerGlobalScope.cpp

@@ -45,6 +45,7 @@ void WorkerGlobalScope::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
     WindowOrWorkerGlobalScopeMixin::visit_edges(visitor);
+    UniversalGlobalScopeMixin::visit_edges(visitor);
 
     visitor.visit(m_location);
     visitor.visit(m_navigator);