LibWeb: Add calls to JS_{DECLARE,DEFINE}_ALLOCATOR()

Author: https://github.com/mattco98
Commit: 31341b280a
Pull-request: https://github.com/SerenityOS/serenity/pull/23878
Issue: https://github.com/SerenityOS/serenity/issues/23805
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/Painting/NestedBrowsingContextPaintable.cpp

@@ -14,6 +14,8 @@
 
 namespace Web::Painting {
 
+JS_DEFINE_ALLOCATOR(NestedBrowsingContextPaintable);
+
 JS::NonnullGCPtr<NestedBrowsingContextPaintable> NestedBrowsingContextPaintable::create(Layout::FrameBox const& layout_box)
 {
     return layout_box.heap().allocate_without_realm<NestedBrowsingContextPaintable>(layout_box);