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/Layout/ImageBox.h

@@ -13,6 +13,7 @@ namespace Web::Layout {
 
 class ImageBox final : public ReplacedBox {
     JS_CELL(ImageBox, ReplacedBox);
+    JS_DECLARE_ALLOCATOR(ImageBox);
 
 public:
     ImageBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>, ImageProvider const&);